DRG locomotive types
The locomotive type (Gattungszeichen) of a German steam locomotive was a secondary classification system introduced after 1924 by the Deutsche Reichsbahn-Gesellschaft (DRG) and comprised four parts: A letter from the adjacent table, that specified the type of locomotive (express train engine, passenger train locomotive, etc.). A number, usually two-digit, the first digit indicating the number of coupled axles and the second the total number of axles on the locomotive.