The rolling stock used on the Isle of Man Railway today is entirely original although, from an original total of 75 carriages, the number serviceable dropped as low as 14, but this total is once again increasing as a result of recent rebuilds The 3 ft (914 mm) gauge railway was provided with a variety of stock from different manufacturers over its time, and types of coach were categorised according to a lettering system, with the original four-wheeled coaches being of A, B, C and D types, and so on. The F prefix encompassed all bogie vehicles including conversions from the A-D series. Letters G-M denoted goods stock. N referred to ex-Manx Northern Railway 6 wheel carriages. The types of stock can be summarised as follows:-
