Bachmann 31-107

Tooling

In 1990, Bachmann entered the UK OO gauge market by acquiring the Mainline brand and its tooling. Among the inherited models was the BR Standard Class 4 4-6-0, originally produced by Mainline in the 1980s. This locomotive represented one of the BR Standard designs introduced in the 1950s for mixed-traffic duties. Bachmann’s early releases used the original Mainline tooling with minimal changes, marking the start of Bachmann’s presence in British outline models.

Tooling Features

• Scale: OO gauge (1:76.2), designed for 16.5mm track.
• Construction: Plastic body shell with separately fitted details typical of Mainline tooling; tender and locomotive bodies were finely moulded for the era.
• Detailing: Good for its time, including handrails, smokebox door detail, and rivet representation. Cab detail was basic and largely moulded.
• Couplings: Standard tension-lock couplers mounted on the tender and locomotive.

Mechanical & Electrical

• Motor & Drive: Split-chassis design with a centrally mounted motor driving the coupled wheels via gears. Electrical pickup was through the chassis halves.
• Minimum Radius: Recommended for second radius curves (approx. 438mm).
• Lighting: No factory lighting provided.
• Weighting: Moderate weight; relied on diecast chassis components for traction.

DCC Capability

The 1990 tooling was not DCC-ready. Conversion required hardwiring a decoder and insulating the split chassis, which was considered challenging for beginners.

Liveries Produced

Early Bachmann releases using this tooling were offered in British Railways lined black and lined green liveries, reflecting the prototype’s mixed-traffic role. Variants included different running numbers and tender types.

Reviews & Commentary

At launch, the model was praised for its accurate proportions and fine body detail compared to contemporary Hornby offerings. However, the split-chassis mechanism attracted criticism over time for reliability issues, electrical pickup problems, and difficulty in servicing. Enthusiasts often noted that while visually appealing, performance could be inconsistent without careful maintenance.

Media & Social Media

Collectors and modellers frequently discuss these early Bachmann models on forums and social platforms, often highlighting their historical significance as part of Bachmann’s UK debut. Videos and guides on servicing the split-chassis mechanism remain popular resources for those restoring these locomotives.

Interesting Notes

• The tooling originated from Mainline’s design, which was considered advanced in the 1980s for its level of detail.
• These models are now regarded as collectible, especially boxed examples in original Bachmann packaging.

Class & Prototype

Operator & Livery

British Railways transformed Britain's fragmented rail network into a unified national system following nationalisation on 1st January 1948. Created from the "Big Four" companies under the Transport Act 1947, BR operated most of Great Britain's railways until rebranding as British Rail in 1965, managing over 20,000 route miles and inheriting nearly 20,000 locomotives of diverse designs.

The organisation pioneered standardisation through its revolutionary BR Standard locomotive programme (1951-1960), producing 999 advanced steam engines under Robert Riddles' direction. These included the versatile Britannia Pacifics, mighty 9F freight engines, and mixed-traffic classes that incorporated the best features from all predecessor companies. The 1955 Modernisation Plan accelerated diesel and electric traction development, creating fascinating mixed-traction operations.

Notable achievements included establishing unified locomotive classification systems, introducing distinctive corporate liveries, and managing the complex transition from steam to modern traction. BR's six regional structure preserved operational diversity whilst enabling standardisation of practices, signalling, and rolling stock that had eluded private enterprise for over a century.

The BR era represents steam traction's final flowering alongside emerging diesel technology, creating unparalleled locomotive variety. Today, this heritage remains highly popular with railway enthusiasts through extensive preserved fleets, heritage railway operations, and comprehensive model ranges from manufacturers like Hornby, Bachmann, and Dapol, making BR subjects essential for authentic post-war British railway modelling across all scales.

British Railways' lined green livery continued for express passenger locomotives from 1956, painted in BS224 Deep Bronze Green (also known as Land Rover Deep Bronze Green) with orange and black lining, maintaining the prestigious finish for the railway's premier motive power. The livery was reserved for the most powerful express passenger classes, including Britannias, Castles, Kings, A4s, Merchant Navy Pacifics, and other premier locomotives rated for top-link express duties. From 1954 onwards, green became more widely adopted across the locomotive fleet, with some mixed-traffic engines also receiving the prestigious finish as regional freedom in livery matters increased following the 1953 Transport Act.

From mid-1956, these locomotives received the new "Lion and Crown" emblem (nicknamed the "Ferret and Dartboard"), a proper heraldic device registered with the College of Arms featuring a rampant lion emerging from a crown and holding a spoked wheel, all enclosed in a roundel with "British Railways" on bars either side. The emblem was positioned centrally on tender sides, with the heraldically correct lion facing left, though some locomotives initially received forward-facing applications during the transition period. Lettering and numbering remained in golden yellow Gill Sans Medium, maintaining the high-quality finish appropriate for express passenger duties. Regional variations in the shade of green occurred depending on which works applied the paint, the suppliers used, and the number of paint layers applied, creating subtle differences between locomotive classes and individual engines. This livery represented the final flowering of BR's steam-era corporate identity, combining technical excellence with heraldic dignity during the twilight years of express steam operations before the Rail Blue revolution of the mid-1960s.