From the locomotive's running number however its purpose could be deduced based on the following allocation of numbers: Because each railway division numbered its locomotives independently using this scheme, there was a locomotive number 120, for example, almost everywhere.
Ud af driftsnummeret kunne man imidlertid udlede lokomotivets anvendelse efter følgende opdeling: Da hver jernbanedirektion nummererede sine lokomotiver på dette grundlag var der f.eks. næsten overalt et lokomotiv nr. 120.