4mm Concertina stock

We don't see much Concertina stock on GWR layouts, perhaps because they were 70' corridor mainline stock and thus quite large vehicles. When introduced in 1906, their range included the Paddington-Neyland expresses (where some of the Brake Thirds ran right up to 1956!) and other premier services. However, some of the Tricompo slips were in fact used as individual coaches on branch services from 1941 (with slip gear removed).