In 1919 Motor Rail manufactured some standard gauge inspection cars for the Ministry of Munitions, and the testing of these cars on the branch line between Bedford and Hitchin was reported in The Engineer. The cars were powered by the two cylinder Dorman engine with Dixon-Abbott 2-speed gearbox, and averaged over 30 mph on the test, and reached 43 mph. One of the cars was run on paraffin, though it was intended they would be run on petrol. They were lightweight at only 3.25 tons, though could carry up to 2 tons payload if required. The seating being easily removable to offer load space.