Heljan have announced plans for a newly tooled range of Class 122 'Bubble Car' single diesel multiple units in TT:120 Scale, available for the first time ever in this Gauge!
The Class 122 is designed to offer something new in this scale - a perfect starting point for TT newcomers. It’s a complete train in a single vehicle, suitable for everything from branch line micro-layouts to busy main line stations. Featuring outstanding detail and all the working functions you’d expect from a new ‘OO’ model - let alone TT scale! The Class 122 opens up enormous opportunities for British ‘TT’ modelling.
Starting with a blank canvas in a new scale allows Heljan to set a high level of standard specification across all products, which includes high-quality mechanisms with small but powerful motors, new generation E24 compact DCC decoder interface, allowing up to 32 digital functions (dependent on decoder), factory fitted speakers, authentic lighting functions and superb attention to detail throughout. In addition, the Class 55 will be the first HELJAN TT 1:120 model to feature two ‘Power Pack’ capacitors to ensure smooth and uninterrupted performance when you need it. ‘Power Packs’ willbe a standard feature on future TT 1:120 releases.
A total of seven different models are to be produced covering the full lifespan of these characterful little DMUs in BR green, BR blue, BR blue/grey and Regional Railways liveries! What's more, one example in the as-introduced BR green with speed whiskers livery is available exclusively here from us at Rails of Sheffield.
EARLY BIRD SPECIAL PRICE
Place your pre-orders now to secure a special reduced introductory price of £189.99.
From 1st December 2025, the price will increase to £199.99.
Pre-Order Now - Exclusive to Rails
Pre-Order Now - General Release
Product Features
Highly detailed model with 100s of separately fitted parts including handrails, exhausts, buffers, full underframe relief and much more
Fully detailed interior with seating, cab detail, partitions and more
Detachable TT standard couplings
Digital & Sound capability - E24 decoder socket and twin factory fitted speakers
Authentic lighting functions including separately switchable headcode panel and marker lights, saloon interior lights and tail lights
Finescale wheels
Authentic livery application and printing
Watch our Launch Video
Prototype Information
Twenty single car Class 122 units were produced by Gloucester RCW in 1958. Nicknamed "Bubble Cars" due to the large expanse of glass in their construction, they were built mainly for use on the London Midland region of British Rail, with some also seeing use in Scotland. They were designed for use on a variety of lightly used branch lines - some of which were closed during the Beeching Axe but others were kept alive thanks to the low cost & simplicity in running these units.