The Class 03 steam engines were standard express train locomotives (Einheitslokomotiven) in service with the Deutsche Reichsbahn.
03 001 at the 2002 Dresden Steam Locomotive Festival
An 03 running in Poland as PKP No. Pm2-34, today preserved at Warsaw, near Toruń with a northbound freight; 1976
The Einheitsdampflokomotiven, sometimes shortened to Einheitslokomotiven or Einheitsloks, were the standardized steam locomotives built in Germany after 1925 under the direction of the Deutsche Reichsbahn-Gesellschaft. Their manufacture made extensive use of standard design features and components.
Einheitslok of the Historic Railway, Frankfurt DRG Class 01 in 2007