Accurascale confirms fourth OO gauge Class 37 run for 2027 delivery

Accurascale is not treating its OO gauge Class 37 as a simple rerun. The company has confirmed a fourth production batch for second-quarter 2027, and this one carries forward the refinement work that customers saw in the third release rather than just recycling the same tooling with fresh numbers.

That matters because the Class 37 is one of the most commercially flexible diesels in British model railways, and Accurascale is leaning into that strength with a spec aimed at both operators and collectors. The new batch includes a powered roof fan, separately fitted bonnet doors, revised glazing and separately fitted side grilles. Inside the body, cab, engine room and driver’s desk lights join a five-pole motor with twin flywheels, stay-alive capability, a cube speaker, hall sensor technology, and all-wheel drive and pickup. In practical terms, that combination points to steadier low-speed performance, stronger sound presentation and better reliability on layouts, while the extra body detailing gives the model more of the layered look that collectors notice in the cabinet.

Accurascale has said the range was shaped by customer suggestions and feedback, and the fourth run makes that approach visible. Alongside the standard releases, the batch includes an exclusive D6724 in early 1960s condition, complete with split headcode boxes, nose-end connecting doors, bufferbeam cowling and an open boiler port. That version pushes the tooling back toward the class’s earliest years, giving layout owners another route into the prototype’s long career and giving collectors a distinctly different variant rather than a near-duplicate of what came before.

The locomotive itself gives the strategy room to breathe. The British Rail Class 37 was built from 1960 to 1965, with 309 examples produced, and it came out of the modernisation plan as a mixed-traffic 1,750hp Co-Co design by English Electric at Vulcan Foundry and RSH. It became a familiar sight across the network, especially in Scotland and East Anglia, and that long service life still feeds the model market with enough liveries, road numbers and era combinations to support repeated runs without the tooling feeling exhausted.

Accurascale is also tying the launch to preservation with an exclusive 37403 Ben Cruachan model in partnership with the Scottish Railway Preservation Society, positioned around Model Rail Scotland in Glasgow. Taken together, the fourth run looks less like a routine encore than a deliberate product-improvement cycle, with Accurascale proving there is still demand for a Class 37 that keeps getting sharper instead of simply coming back again.