This kit represents the shallow vented (10¼”) version of D2318. A similar deep vented (15″) coach, to the same diagram number, is represented by our product S6K. Carriages 5740-50 were also to D2318, but had extended side panels covering the solebars. Note also that coach number 5751 was a prototype vehicle to D2315 and differed from the rest of the group. It ran in set 770.