| DR Class 125 | |
| Numberbuilt: | 18 power cars, 18 trailer cars |
| Yearconstruction: | 1934-1935 |
| Yearscrapped: | 2003 |
| Manufacturer: | O&K, Dessauer Waggonfabrik, Wegmann – Wagenkästen; AEG, SSW – elektrischer Teil |
| Uicclass: | Bo'Bo'+2'2' |
| Maxspeed: | 90km/h |
| Trainlength: | 36.2m (118.8feet) |
| Weight: | 59t |
| Safety: | mechanical train stop |
| Electricsystem: | 750 V DC third rail |
| Collectionmethod: | Contact shoe |
The 1941 Class ET 125, later adjusted series 276.0 (DR) or 477 (DBAG), was an electric railcar which traversed the DC-powered S-Bahn in Berlin during 1934/35. It was built in 1936 and 1938. The cars, which were popularly known as banker trains, were rebuilt after World War II and the series ET / EB 166 adapted. Among other things, they lost the more powerful 1949/50 traction motors. From the 1970s, they were included in the modernization program and in series 277 rebuilt (after 1991 477/877), they were used on Berlin's S-Bahn network until 2003.
These trains were deployed when the section between Potsdamer Ringbahnhof and Wannsee were electrified including the part of Zehlendorf stretch.