LIMITED TIME ONLY offer ends Saturday 20th at 9am ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏

FLASH SALE EXCLUSIVE DERBY LIGHTWEIGHT 'TEST UNIT GEMINI'
For the first time you can save over £40 on the EXCLUSIVE model of the unique 'Test Unit Gemini' battery-electric multiple unit by Bachmann in OO Gauge! This OO Gauge model utilises the award-winning 'Derby Lightweight' tooling and replicates the unit in its BR Research Department red & blue colour scheme. 'Gemini' is a must-have for fans of quirky British Rail experiments such as this fascinating prototype!
FLASH SALE ENDS: Saturday 20th September 2025 at 9am
Order Here →
Order Yours Now:
Derby Lightweight 2-Car BEMU 'Test Unit Gemini' BR RTC (Original)
£239.50 £284.95
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Weathered version also available:
Custom Weathered Derby Lightweight 2-Car BEMU 'Test Unit Gemini' BR RTC (Original)
£289.95
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Watch our Video:
Learn about the history of the real 'Test Unit Gemini' unit and see the model in action.
Features Include: Highly detailed model with separately fitted parts including wipers, pipework, gangways, underframe relief and more Fully detailed interior with cab and passenger saloon Discrete 5-pole motor with flywheel powering one car, with all-wheel pickups Digital capability - 8-pin socket (in driving car) + 6-pin socket (in trailer car) Directional and passenger saloon lighting. Lighting is always on (when power is applied) on analogue, on DCC the directional lights can turned On/off with F0, but saloon lights will be ‘always on’ NEM tension lock couplings (Outer ends), International hook & loop coupling between cars Separate metal bearings on driving wheels Accessory pack with bufferbeam pipes, dummy coupling etc.
About 'Test Unit Gemini':
Image by Martyn Sanders
The British Rail BEMU was an experimental two-car battery electric multiple unit (BEMU), converted from the prototype Derby Lightweight Diesel multiple units. The train was powered by many lead-acid batteries , and was used on the Deeside Railway from Aberdeen to Ballater in Scotland from April 1958 until it was finally withdrawn in December 1966. The North of Scotland Hydro-Electric Board initiated the design and was a joint sponsor. The board promised to supply power at three farthings per unit for a fixed two-year period. It provided an 11kV supply to a charger at Aberdeen's platform 1 and a 6.6kV supply to a charger at Ballater. The train then spent a short time in storage at Inverurie Works, and at Hyndland Shed in Glasgow, before being transferred to departmental use as test train "Gemini" (or "Laboratory 16") for use at the Railway Technical Centre, at Derby. Following a full refurbishment, 'Gemini' entered use in the now-familiar Research department red and blue colourscheme, and was instrumental in testing the latest developments of the Automatic Train Protection signalling system, making regular appearances on the Mickleover test track, as well as further afield near Swindon. Following withdrawal, the unit has returned to its native Scotland where it lives on in preservation.
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