In 2019, Bachmann upgraded the Graham Farish Class 150 DMU tooling to include provision for sound fitting, marking the first time SOUND FITTED versions became available for this class. The upgrade featured an enhanced chassis design to accommodate sound equipment, with all models now factory-fitted with speakers - even non-sound versions to assist modellers wishing to fit their own decoders.
SOUND FITTED models offer synchronized sound effects on both analogue (DC) and DCC control systems, providing authentic audio straight from the box. This upgrade maintained the existing 6-pin DCC interface while adding the new sound capabilities, ensuring compatibility with the established Class 150 range while bringing the models up to modern sound-equipped standards.
The 2019 announcement included both upgraded existing liveries and new variants, continuing the model's availability in multiple operator schemes whilst offering modellers the choice between sound-fitted and traditional versions.