(Philippine service) LMS 10000 & 10001 The LMS Diesels 10000 & 10001, later classified as British Rail Class D16/1, were introduced in 1947. These were Great Britain's first mainline diesel locomotives, coming about a decade after America's first cab units. Despite their streamlined exterior, they are actually cowl units rather than cab units. It is easy to misinterpret this as in North America, cowl designs are more angular, while cab designs have a similar curved streamlining. References Pinkepank, Jerry A., and Marre, Louis A. (1979). Diesel Spotter’s Guide Update, pp. 70–79.Kalmbach Publishing . Diesel locomotives Locomotive body styles