Series 01
Series 01 stands for:
- DR class 01 , standard express train locomotives of the Deutsche Reichsbahn with two-cylinder engines
- DR class 01.10 , standard express train locomotives of the Deutsche Reichsbahn with three-cylinder engines
- BDŽ class 01 , standard express train locomotives of the Bulgarian State Railways
See also: DR series 02 , standard express train locomotives of the Deutsche Reichsbahn with four-cylinder engines, later converted into series 01 .