GWR Collett B Set — The Great Western's Perfect Branch Line Coach

Historical Background and Introduction

When Charles Benjamin Collett succeeded George Jackson Churchward as Great Western Railway Chief Mechanical Engineer in 1922, he inherited both a brilliantly engineered railway and a very deliberate design philosophy. Where Churchward had been a bold innovator — introducing the Toplight coach with its distinctive high clerestory-free elliptical roof and small upper lights in 1907, and championing steel-panelled construction from 1912 — Collett was, by temperament and conviction, an improver. His genius lay in refining and standardising what Churchward had built rather than striking out in new directions. That approach, applied to the GWR's branch line carriage stock, produced the B Set: one of the most quietly effective passenger vehicles in British railway history.

The operational logic behind the B Set was disarmingly simple. The GWR's vast network extended deep into the rural west of England, the Welsh valleys, and the Marches. Dozens of branch lines terminated at single-platform stations where a long locomotive-hauled express formation would have been laughably over-specced and operationally impractical. What these lines needed was a compact, robust, self-contained train that could be worked economically by a modest tank engine, required minimal maintenance, and could be quickly identified and managed by divisional operating staff. The B Set — two identical Brake Composite coaches coupled semi-permanently with their brake ends outermost — answered every one of those requirements.

The "B Set" was an official, or at minimum semi-official, Great Western Railway operating term, not a later enthusiast coinage. The designation predates Collett: pre-Collett Diagram E40 coaches of 1895 vintage were already referred to as B Sets. In Collett's era the terminology was formalised, with each set given a specific route branding stencilled at cantrail level on the outer brake end — "Bristol Division No. 1," "Helston No. 2," "Bodmin Branch No. 1" — in white capital letters approximately three inches high. This level of operational specificity was quintessentially GWR: methodical, systematic, and remarkably useful to station staff and operating inspectors alike.

Collett's broader carriage programme of the 1920s and 1930s ran several parallel streams simultaneously. Bow-ended corridor coaches appeared from 1922 in 57-foot and 70-foot lengths; the C Set (a four-coach non-corridor suburban formation under Diagrams D109/C61/E141) was developed from 1930 for higher-capacity Cardiff and Birmingham Division services; and Q Sets served the London suburban routes out of Paddington. The B Set sat squarely in the middle of this programme as the standard branch line solution, its design evolving across six diagram variants that tracked Collett's broader technical preferences — most notably his adoption of the seven-foot single-bolster bogie and the tapered-side body profile.

Design, Construction, and Technical Specifications

Every Collett B Set vehicle was a Brake Composite: a coach divided between a guard's/luggage compartment, one First Class passenger compartment, and five Third Class compartments. Two vehicles were permanently coupled — inner ends joined by a fixed link with no gangway connection — producing a six-compartment passenger section at the centre flanked by guards' accommodation and full-length buffers at each outer end. There were no lavatories, no corridors, and no gangways. Passengers chose their compartment at the platform and stayed in it for the journey.

The body construction followed Churchward's steel-panelled approach. Frames were timber-cored with steel outer panels, giving a combination of structural rigidity and relatively straightforward repair. Roofs were elliptical and steel-panelled — the clerestory roof that characterised earlier GWR stock was already two decades in the past by the time the first B Set appeared in 1924. All coaches received electric lighting from new, charged by a Stone's axle-driven dynamo and stored in battery boxes on the underframe. Steam heating was provided via locomotive-supplied pipes running the coach length; the guard's compartment included an emergency brake valve operating on the GWR's characteristic 25 inches of mercury vacuum system.

The outer ends of each vehicle carried standard GWR screw couplings and full-length buffers. The inner coupling arrangements varied across diagrams, evolving from a fixed tommy-bar link (E116) through a channel-section over a forged solid link with buffing plates (E129) to short inner buffers with a slotted tommy-bar and safety chains (E135 onwards). No B Set was ever fitted with Buckeye automatic couplings, which the GWR reserved for its corridor express stock.

Feature	Specification
Builder	Swindon Works, Great Western Railway
Years built (Collett era)	1924–1936
Years built (BR era)	1952–1954 (Diagram E167)
Quantity built (Collett era)	~276 vehicles (~132 sets)
Formation	Two Brake Composites coupled brake-end outward
Body length	57ft 0in (E116/E147); 58ft 2in (E129); 57ft 0in (E135); 61ft 2in over bow ends (E140/E145)
Body width (waist)	9ft 3in (E116/E140); 9ft 0in (E147); 8ft 10in (E135)
Bogie type	9ft fishbelly (E116/E129); 7ft Collett single-bolster (E135/E140); 9ft heavy plate-frame or 7ft Collett (E145); 9ft pressed steel (E147)
Braking	Vacuum, 25in Hg, with guard's emergency valve
Heating	Steam, locomotive-supplied
Lighting	Electric (Stone's dynamo and batteries)
Roof profile	Elliptical (no clerestory)
Gangways	None — non-corridor, non-gangwayed
Tare weight	Data unavailable — verify against Harris/Russell
Maximum speed	Data unavailable — verify against GWR working notices

Historical Insight — The Inner Coupling Problem: One of the least-discussed engineering details of the B Set is the evolution of the inner coupling arrangement. The E116's simple fixed tommy-bar worked well enough on flat, straight branches but provided limited buffing capacity on hilly routes where slack ran in and out. By the E135 of 1929, short inner buffers had appeared; by the E147 of 1933, a slotted tommy-bar with safety chains had become standard. These successive refinements reflect precisely the kind of incremental engineering improvement that characterised Collett's entire tenure at Swindon.

Sub-types, Diagrams, and Variants

Six GWR diagram numbers cover the Collett-era B Set production, each representing a distinct generation of the design.

Diagram E116 (1924) was the original Collett B Set, produced under Lot 1327 as 14 coaches (seven pairs). Measuring 57ft × 9ft 3in, these flat-ended vehicles rode on nine-foot fishbelly bogies. Running numbers included 7169–7172, 7510–7511, 7574–7579, and 7625–7626. All were allocated to the Bristol Division and proved remarkably durable, surviving in service until 1962 — a 38-year working life.

Diagram E129 (c.1926) introduced the bow-end profile to the B Set. Ten coaches (five pairs) were built under Lot 1355, measuring approximately 58ft 2in over the bowed ends and retaining the nine-foot fishbelly bogie. Running numbers included 6545, 6547, 6551, 6553, 6556, 6560–6561, 6563, and 6565–6566. The First Class compartment was repositioned to the fifth bay, placing one Third Class compartment between it and the brake section.

Diagram E135 (1929) was a brief experimental variant: just four coaches (two pairs) built under Lot 1393, completed March 1929. The body was narrowed to 8ft 10in and the vehicles rode on the new seven-foot Collett single-bolster bogie — its first appearance on B Set stock. Short inner buffers appeared for the first time. Running numbers: 6640–6643. Initially Bristol Division coaches, these later migrated to the Looe branch.

Diagram E140 (1930–31) is the classic B Set. Three lots totalling 82 coaches (41 pairs) were produced, making this the largest single-diagram group. The body grew to 61ft 2in over the bow ends and 9ft 3in at the waist, tapering approximately three inches narrower at the cornice — characteristic of Collett's tapered-side body family. The recessed door handles (necessary because the wider body approached loading gauge limits) are the instantly recognisable identifying feature. Seven-foot Collett bogies were standard throughout. Running numbers were scattered across the 6240s through 6980s.

Diagram E145 (1933) was effectively an E140 with bogie variations. Fifty coaches (25 pairs) were built under Lot 1479. The first twelve pairs received seven-foot Collett bogies; the last thirteen pairs rode on nine-foot heavy plate-frame bogies, and some later received pressed steel bogies during BR service. The body was identical to the E140.

Diagram E147 (1933–36) marked a deliberate change of direction. Approximately 116 vehicles were built across four lots (1494, 1505, 1523, and 1550), reverting to the shorter 57ft × 9ft flat-ended body and adopting nine-foot light pressed steel bogies. Door handles were flush (unrecessed), reflecting the narrower body width. Running numbers ran through the 67xx–68xx–69xx series. Two vehicles from Lot 1550 — 6818 and 6820 — were converted to independent auto-coaches under Diagram A32 in 1936, the only B Set coaches known to have been converted to push-pull working.

A note on a later successor: Diagram E167 (1952–54), built under British Railways to a Hawksworth-influenced design, produced 30 further coaches (Lots 1750, 1775, and 1777) at 63ft × 8ft 11in. These ran primarily as singles rather than paired sets and are best regarded as a separate type rather than true B Sets.

Modelling Tip — Knowing Your Diagram: The distinction between diagrams matters enormously when choosing models. The OO gauge Rapido Trains UK model represents the E140 (bow-ended, 61ft 2in, tapered sides, recessed door handles). The Dapol N gauge and Lionheart by Dapol O gauge models are also based broadly on the E140 family. If you want the flat-ended E147 in OO, your options are the older Airfix/Mainline/Hornby tooling or the Wizard Models etched brass kit W51K. For the E129, the Wizard Models W50K is the only serious option in 4mm scale.

Service History and Operating Companies

The geography of B Set operations is effectively a map of GWR rural England and Wales. Allocations were carefully managed by each divisional superintendent, with individual sets assigned specific route brandings and replaced into the general pool only when works visits disrupted their regular diagrams.

The Bristol Division was the largest single user, operating sets branded "Bristol Division No. 1" through at least "No. 49." Cornwall was B Set heartland: the Helston branch had its own sets ("Helston No. 1" and "No. 2"), as did St Ives ("St Ives No. 1/No. 2"), Bodmin ("Bodmin No. 1/No. 2"), and Newquay ("Newquay Branch No. 1" through "No. 5"). The Looe and Liskeard line used sets branded "Liskeard and Looe No. 1/No. 2." In Devon, the Kingsbridge branch and Ashburton branch each maintained dedicated B Set allocations.

The Midlands and Cotswolds routes included the Kingham branch (Cheltenham to Kingham via Andoversford, where the Lionheart Dapol model's "Kingham Branch" livery variant originates), while South Wales absorbed many of the later E147 coaches, with Cardiff Division sets numbered into the 40s and 49s.

The later Diagram E147 sets spread further across the system, reaching Cambrian lines including workings to Llanfyllin, Llanymynech, and Oswestry — a long way from the Cornwall and Somerset heartlands of the earlier diagrams.

B Sets were always locomotive-hauled. This is an important distinction that is easily overlooked: unlike the contemporary GWR auto-trailers (which could be driven from a cab at the coach end with the locomotive propelling), B Sets had no driving cab, no control linkage, and no regulator gear. At every terminus, the locomotive was required to run around its train via a loop or headshunt before departure. The operational implication was that B Sets required a loop at each end of their branch — a constraint the GWR factored into branch line infrastructure design.

The defining partnership was a GWR 45xx or 4575 Class Small Prairie 2-6-2T and a pair of chocolate-and-cream Brake Composites. These tank engines were virtually purpose-built for this work: powerful enough for the gradients of the Cornish and Devon branches, light enough for lightly laid track, and fitted with both push-pull and conventional working capability. On flatter branches the 2251 Class 0-6-0 was common motive power, while 57xx and 64xx Class Pannier Tanks appeared on shorter, less demanding workings.

B Sets passed to British Railways on 1 January 1948 and were renumbered with the W prefix (for Western Region) and a W suffix. GWR 6907 became W6907W. No TOPS codes were ever assigned — that system was applied to locomotives and multiple units, not hauled coaching stock. Post-nationalisation liveries began with BR crimson (unlined, the standard early livery for non-corridor stock), progressing to BR maroon (lined and unlined from around 1956) and BR chocolate and cream on selected Western Region coaches from 1956 onwards.

Mass withdrawals followed the arrival of diesel multiple units on former GWR branches from 1957. Individual E140 coaches began appearing in condemnation lists from February 1959. Most B Sets were gone by 1962, with the remarkable E116 examples — built in 1924 — lasting to the very end of that year. Some vehicles entered departmental service with numbers in the 079xxx series before final scrapping, but none survived for preservation.

Compared with contemporary practice on the other Big Four railways, the GWR's B Set approach was characteristically systematic. The LMS operated Stanier non-corridor coaches in various ad hoc Brake Third/Third formations without the GWR's formalised paired-set philosophy. The LNER favoured articulated Quad-Art and Quint-Art sets for high-density suburban traffic and deployed Gresley non-corridor coaches elsewhere. The Southern Railway, uniquely, made the widest use of push-pull motor-fitted coaching stock, with far fewer fixed locomotive-hauled branch formations than the GWR. In hindsight the GWR's rigidly paired B Set, operated by a locomotive that had to run around at each terminus, looks operationally conservative compared to the Southern's auto-train philosophy — but it was supremely effective within the GWR's own operating parameters.

Withdrawal, Preservation, and Surviving Examples

There are no genuine GWR Collett B Set vehicles in preservation. This is one of the most significant gaps in the preserved GWR coaching stock fleet, and it is worth understanding why it occurred.

Non-corridor compartment coaches were the last type of hauled passenger stock that heritage railways sought to preserve in the 1960s. Their small compartments, lack of lavatories, and fixed seating made them unattractive for conversion to departmental or staff accommodation vehicles — a fate that saved many corridor coaches. By the time the preservation movement had gathered momentum and heritage railways were actively seeking ex-BR stock in the mid-1960s, all Collett B Set vehicles had already been scrapped. The withdrawal window of 1959–62 was simply too early.

The Great Western Society at Didcot Railway Centre holds one of the finest collections of preserved GWR coaching stock in existence, including Toplight coaches, Collett corridor coaches, and Hawksworth stock — but no B Sets. The Severn Valley Railway holds GWR No. 6913, which is a Brake Composite, but of Diagram E148 — a 60ft corridor vehicle, emphatically not a B Set — and is sometimes confused with the B Set type by newer enthusiasts. The South Devon Railway, West Somerset Railway, Bodmin and Wenford Railway (which operates on routes B Sets once worked), and Llangollen Railway hold no genuine B Set examples, although the Llangollen Railway does operate a pair of non-corridor coaches in a B Set-style formation — the identity of these vehicles should be verified locally before citing them as authentic examples.

Neither the National Railway Museum in York nor the STEAM Museum in Swindon holds a B Set vehicle. The preserved GWR auto-trailers at Didcot, the SVR, and the South Devon Railway provide the closest flavour of the branch line era these coaches served, but they are a different prototype class entirely.

The practical implication for enthusiasts is that a B Set can only be experienced through historical photography, documentary film, and — increasingly — through the outstanding scale models that have become available in recent years.

Modelling Significance and Scale Replications

The B Set has attracted modelling attention across all three principal scales since the late 1970s, with coverage intensifying markedly in the 2010s and 2020s as the hobby's standards for accuracy and finish rose dramatically.

OO Gauge (1:76)

The OO gauge story begins in 1977 with the Airfix GMR tooling — a groundbreaking product for its time that established the B Set in ready-to-run form decades before most of its contemporaries. This tooling passed through Mainline (from around 1981), Dapol (late 1980s), and finally Hornby (from 1997) as each successive owner updated the range's livery options. The Hornby releases, catalogued under numbers including R4030 (and variants A, B, D), R4319A/B, R4549 series, R4099A/B, and R4293 series, were sold as individual coaches rather than prototypically correct pairs. They are now all discontinued but widely available on the second-hand market for £5–£30 per coach.

The decisive step-change arrived in late 2024 when Rapido Trains UK released its all-new Diagram E140 B Set in OO gauge — the first purpose-built, highly detailed ready-to-run B Set in this scale. Sold exclusively as twin packs at £169.95 RRP, the Rapido model features separately applied door handles and handrails, fully detailed and painted interiors with etched luggage racks and printed carriage prints, working internal lighting activated by a magnetic wand, NEM-pocket couplings with a close-coupled inner coupling, and a simply removable roof giving access to the interior. Eleven catalogue numbers cover the full livery spectrum.

Catalogue No.	Livery	Notes
946001	GWR Shirtbutton, Bodmin Branch No. 2 (No. 6977/6778)	First to market
946002	GWR Shirtbutton, St Ives No. 1 (No. 6481/6482)
946003	GWR Twin Cities Crest, Bristol Div. No. 9 (No. 6653/6654)
946004	GWR Twin Cities Crest, Liskeard & Looe No. 1 (No. 6403/6404)
946005	GWR Wartime Brown (No. 6909/6910)	Unlined all-over brown
946006	GWR Wartime Brown (No. 6409/6410)
946007	BR Crimson (No. W6655W/W6656W)	Derails exclusive
946008	BR Crimson (No. W6977W/W6978W)
946009	BR Maroon lined (No. W6405W/W6406W)
946010	BR Maroon unlined (No. W6907W/W6908W)
946011	BR Chocolate and Cream (No. W6653W/W6654W)

Bachmann produces Collett 60ft corridor coaches in OO — a different prototype — and has no B Set in its range. Accurascale, Oxford Rail, and Dapol (OO gauge) have not produced B Sets.

N Gauge (1:148)

Dapol has been the sole N gauge B Set manufacturer since December 2003, when the first releases made history as the first British pre-nationalisation coaches available ready-to-run in N gauge since the Minitrix Gresley teak sets of the 1970s. The 2P-003 series now extends to over 26 catalogue variants sold as twin packs at approximately £30–38 per pack. The range covers GWR shirtbutton chocolate and cream (2P-003-002, -003), GWR post-war twin cities crest (2P-003-012, -013), BR crimson (2P-003-015), and BR maroon in lined and unlined versions. Graham Farish has never produced a B Set.

O Gauge (1:43.5)

The Lionheart Trains by Dapol range, released from 2017, offered B Sets across 28+ catalogue variants encompassing twin packs (LHT-600 to LHT-613) and four-coach packs (LHT-620 to LHT-627). Features include scale length, accurate roof and side profiles, die-cast bogie frames, sprung metal buffers, and fully detailed interiors. Branch-specific livery variants include Bodmin, St Ives, Kingsbridge, Kingham, Cardiff Division, Bristol Division, and others. All variants are currently out of production; second-hand examples command premium prices reflecting their desirability.

Kits and Scratch-Building

For modellers seeking specific diagrams or the finest possible accuracy in EM or P4, Comet Models / Wizard Models produces two relevant etched brass kit ranges in 4mm scale:

• W50K — Diagram E129 (57ft bow-ended Brake Composite, approximately £54 per coach; sides-only option W50S available at approximately £13–16)
• W51K — Diagram E147 (57ft flat-ended Brake Composite, approximately £54–60 per coach; sides-only W51S available)

Two kits are required per complete B Set pair. Worsley Works produces etched scratch aids for the Diagram E40 (the pre-Collett 50ft B Set, £43) and can supply work in virtually any scale — 2mm, TT:120, HO, and S gauge — from their artwork on request.

Ratio Plastic Models covers only pre-grouping GWR four-wheel coaches and has no B Set. Roxey Mouldings specialises in pre-grouping and Southern Railway stock. No dedicated 3D-printed B Set files have been identified on major platforms, and no OO9 equivalent exists, as the B Set was a standard-gauge vehicle throughout its life.

Modelling Tip — Interior Lighting: The Rapido Trains UK OO model is the only B Set ready-to-run with factory-fitted working interior lighting. A magnetic wand activates the lighting circuit through the floor. If you are building a static display or a well-lit layout scene with the older Airfix/Hornby tooling, third-party LED strip kits from DCC Concepts or Gaugemaster can be fitted to the roof interior — the removable roof on the Rapido model makes this especially straightforward.

Unique Modelling Tips and Layout Integration

A B Set, properly modelled and operated, is among the most satisfying of all GWR coaching stock projects. The key is understanding how these coaches actually worked and what elements create the authentic period impression on a layout.

Match your diagram to your era and branch. If you are modelling Cornwall in the late GWR period (1930s–early 1940s), an E140 in shirtbutton chocolate and cream is correct — and the Rapido model is your ideal solution. For a post-war or early BR scene on a South Wales branch, an E147 in plain GWR brown or BR crimson is more appropriate; the older Hornby tooling or the Wizard Models W51K are your options here. The E116 (flat-ended, shorter body) is only correctly represented by scratch-building or heavily modifying an existing model.

Always model them as pairs. B Sets were semi-permanently coupled throughout their service lives. Running a single B Set Brake Composite is technically incorrect and immediately noticeable to any informed viewer. Buy the Rapido twin packs, or purchase two matching Dapol N gauge coaches, and keep them together. The inner coupling on the prototype had no gangway and no buffers visible to passengers; aim to minimise the visible coupling gap between the inner ends on your model.

Get the route branding right. This is the detail that separates a generic GWR branch line scene from a specific, plausible working. The Rapido models each carry specific branch brandings already applied: "Bodmin Branch No. 2," "St Ives No. 1," and so on. If using older Hornby or Dapol models without branding, adding a small white lettered transfer at cantrail level on each outer brake end will transform the model's accuracy. Precision Labels and Railtec Transfers both produce appropriate GWR white lettering sheets.

Choose your motive power carefully. A GWR 45xx Small Prairie 2-6-2T is the canonical B Set locomotive — virtually every major OO manufacturer produces one (Hornby, Bachmann, Dapol). For the early BR period, a BR Standard Class 2 2-6-2T or an LMS Ivatt Class 2 2-6-2T is prototypically appropriate. A 2251 Class 0-6-0 works well for less hilly branches, and a 57xx Pannier Tank suits shorter, lighter workings. Avoid modern traction, multiple units (B Sets were never operated as multiple units), and anything that would look out of place on a 1930s–50s branch line.

Terminus station layout design. Because B Sets were never fitted for push-pull working, every B Set terminus required a locomotive run-round loop. On a model layout this is a positive design requirement: a simple loop of 12–15 inches (in OO) at the buffer stop end is all that is needed, and it immediately justifies authentic shunting moves in your operating sessions. A Prairie tank arriving at a Cornish terminus, propelling its set onto the loop while the guard sets the point, then running around to couple at the other end, is one of the most satisfying operational sequences in GWR branch line modelling.

Livery transitions for long-layout timelines. If your layout spans the late GWR and early BR periods, a mixed rake approach is prototypically defensible: some sets may have received BR crimson by 1949–50 while others remained in GWR brown or chocolate and cream. The Rapido range includes both GWR wartime brown and BR crimson variants for precisely this reason — you can represent a transition period with vehicles in mixed condition without any historical inaccuracy.

Modelling Tip — Formation Authenticity: A correct B Set formation for a typical Cornish branch in the mid-1930s is: one E140 Brake Composite (chocolate and cream shirtbutton livery, branch branded) + one matching E140 Brake Composite (chocolate and cream shirtbutton livery, same branch brand), coupled inner-end to inner-end, hauled by a 45xx Prairie tank in GWR green with a cast safety-valve cover. The entire locomotive-plus-two-coach train fits comfortably into under 500mm in OO — ideal for small to medium layouts.

Finally

The GWR Collett B Set is a vehicle that demands a second look. On the face of it, two non-corridor Brake Composites with no lavatories, no gangways, and no remarkable technical innovations might seem like an unlikely subject for enthusiast devotion. But step back and appreciate what these coaches actually achieved, and the picture changes entirely.

For roughly forty years — from 1924 to the early 1960s — the B Set was the face of Great Western branch line travel. It was the coach that carried holidaymakers down to St Ives, delivered market-goers to Bodmin, and transported schoolchildren along the Kingham branch. It defined the visual language of the GWR rural railway as powerfully as the pannier tank or the Great Western green locomotive. The chocolate-and-cream livery, the white branch branding on the outer ends, and the compartment arrangement that put every passenger firmly in their own enclosed social world — these were not quirks but features, carefully designed to meet the real needs of the communities the GWR served.

The irony is that the B Set's very practicality contributed to its preservation failure. These were working coaches, used hard and replaced as soon as something more economical came along. By the time the heritage movement had the resources to save them, they were gone. That makes the modelling record all the more important, and the arrival of Rapido Trains UK's landmark 2024 OO release — the most detailed and accurate B Set model ever produced — all the more significant.

If you model the GWR branch line era at any scale, a B Set pair hauled by a Small Prairie is not merely a desirable addition to your layout. It is the scene. It is what the Great Western looked like at its most characteristic: purposeful, neatly turned out, and entirely at home in the landscape it served.

FAQs

What is a GWR B Set, and where does the name come from?

A B Set is a pair of GWR non-corridor Brake Composite coaches semi-permanently coupled with their brake ends outermost, forming a self-contained two-coach branch line train. The "B Set" designation was an official Great Western Railway operating term — not an enthusiast coinage — and predates the Collett era, though it was most widely applied to Collett's coaches built from 1924 onwards. The "B" most likely refers to the Brake Composite vehicle type.

How many GWR Collett B Set coaches were built, and which diagrams covered them?

Approximately 276 coaches were built under Collett's tenure across six GWR diagram numbers: E116 (1924, 14 coaches), E129 (c.1926, 10 coaches), E135 (1929, 4 coaches), E140 (1930–31, 82 coaches), E145 (1933, 50 coaches), and E147 (1933–36, approximately 116 coaches). A further 30 coaches to the successor Diagram E167 were built by British Railways in 1952–54.

What routes and branches did GWR B Sets work?

B Sets worked virtually every major GWR branch line, with the heaviest concentration in Cornwall and Devon: the Helston, St Ives, Bodmin, Looe, Kingsbridge, Newquay, and Ashburton branches among others. They also operated on Midlands and Cotswolds branches (including the Kingham branch), South Wales valley lines, and Cambrian routes to Llanfyllin and Oswestry. Each set typically carried a route branding stencilled on its outer brake ends.

Were GWR B Sets used for push-pull (auto-train) working?

No. B Sets were locomotive-hauled throughout their operational lives and were not fitted for auto-train (push-pull) working. They carried no driving cab, no regulator gear linkage, and no control apparatus. At terminus stations, the locomotive always ran around the set. Two E147 coaches (6818 and 6820) were converted to auto-coaches under Diagram A32 in 1936, but these were then individual vehicles, no longer part of a coupled pair.

Are any GWR Collett B Set vehicles preserved?

No genuine Collett B Set vehicles have survived into preservation. All were scrapped by the early 1960s, before the heritage movement had the resources to save them. No example is held by the Great Western Society (Didcot), the National Railway Museum, STEAM Museum Swindon, the Severn Valley Railway, the South Devon Railway, or any other heritage railway. Preserved GWR auto-trailers at several heritage sites give a flavour of the era but are a different prototype type.

What is the best OO gauge model of a GWR B Set?

The definitive OO gauge model is the Rapido Trains UK Diagram E140 twin pack, released in late 2024 at £169.95 RRP across eleven catalogue numbers (946001–946011). It features a fully detailed interior, working lighting, separately applied fittings, and liveries spanning GWR shirtbutton, GWR wartime brown, BR crimson, BR maroon, and BR chocolate and cream. Older Airfix/Mainline/Hornby tooling remains available second-hand at £5–£30 per coach but represents 1970s–1990s standards of detail.

What N gauge models of GWR B Sets are available?

Dapol has been the sole N gauge manufacturer since 2003, producing over 26 variants in its 2P-003 series sold as twin packs at approximately £30–38 each. Liveries cover GWR shirtbutton and twin cities crest chocolate and cream, GWR wartime brown, BR crimson, and BR maroon. No competing manufacturer — including Graham Farish — has produced a B Set in N gauge.

Are GWR B Sets available in O gauge?

Yes. Lionheart Trains by Dapol released B Set twin packs (LHT-600 to LHT-613) and four-coach packs (LHT-620 to LHT-627) from 2017, covering GWR chocolate and cream, GWR wartime brown, BR crimson, and BR maroon with numerous branch-specific liveries. All variants are currently out of production; second-hand examples are actively sought and command premium prices.

What etched brass kit options exist for the GWR B Set in 4mm scale?

Comet Models / Wizard Models produces two 4mm scale kits. Code W50K covers Diagram E129 (the 57ft bow-ended Brake Composite, approximately £54 per coach), and W51K covers Diagram E147 (57ft flat-ended, approximately £54–60 per coach). Sides-only options W50S and W51S are available at approximately £13–16 each. Two kits are required per complete B Set pair. Worsley Works can supply etched scratch aids in most scales on request.

How does a GWR B Set compare to contemporary branch line stock on other railways?

The B Set's fixed paired formation was a characteristically GWR solution. The LMS used non-corridor coaches in ad hoc formations without the GWR's systematic paired-set philosophy. The LNER developed articulated Quad-Art and Quint-Art sets for suburban density and deployed Gresley non-corridor stock elsewhere. The Southern Railway made the widest use of auto-train push-pull working, arguably a more operationally flexible approach. The GWR's insistence on locomotive run-round operations looks conservative by comparison, but was supremely effective within the company's own working practices.

How should I correctly model a GWR B Set on my layout?

Always model B Sets as pairs — a single Brake Composite alone is incorrect. Match your diagram to your era: the Rapido OO model is an E140 appropriate from 1930 onwards; older Hornby models or the Wizard Models W51K represent the E147. Ensure your terminus station includes a locomotive run-round loop, as B Sets required this for every working. Choose motive power appropriate to your branch: a 45xx or 4575 Small Prairie 2-6-2T for Cornwall and Devon, a 2251 Class 0-6-0 for flatter branches, or a 57xx Pannier Tank for short, light workings.

What locomotives typically hauled GWR B Sets?

The most closely associated motive power is the GWR 45xx or 4575 Class Small Prairie 2-6-2T, which was virtually purpose-designed for branch line work and regularly paired with B Sets across Cornwall and Devon. 2251 Class 0-6-0 tender engines were common on Midlands and Welsh branches. 57xx and 64xx Class Pannier Tanks appeared on shorter workings. In early BR days, BR Standard Class 2 2-6-2Ts and LMS Ivatt Class 2 2-6-2Ts also took over former GWR branch workings.