DBAG Class 423

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DBAG Class 423/433
Three coupled Class 423 at Frankfurt West station
Manufacturer	Adtranz/Bombardier, Alstom LHB & ABB consortium
Constructed	1998 - 2007
Number built	462
Predecessor	Class 420
Successor	Class 422, Class 430
Operators	DB Regio
Lines served	Munich S-Bahn, Cologne S-Bahn, Frankfurt S-Bahn, Stuttgart S-Bahn
Specifications
Train length	67,400 mm (221 ft 1+9⁄16 in)[1]
Floor height	1,025 mm (40.4 in)
Wheel diameter	850 mm (33.46 in)[1]
Wheelbase	Jacobs bogie: 2,700 mm (8 ft 10+5⁄16 in)[1]
Maximum speed	140 km/h (87 mph)
Weight	105 t (103 long tons; 116 short tons)
Traction system	Electric (ADtranz GTO/IGBT-VVVF)
Traction motors	8× ADtranz WIA 3558 G (4-pole asynchronous)[2]
Power output	2,350 kW (3,150 hp)
Gear ratio	1 : 6,33[1]
Electric system(s)	15 kV 16.7 Hz AC
Current collector(s)	Pantograph
UIC classification	Bo′(Bo′)(2′)(Bo′)Bo′
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The Deutsche Bahn Class 423 EMU is a light-weight articulated electric railcar for S-Bahn commuter networks in Germany. The train has similar dimensions to its predecessor, the Class 420 EMU, but is significantly lighter and has one large passenger compartment, while that of the 420 is divided into three parts. The 423 additionally has six doors in each carriage (three on each side), which is down from eight on the 420 (four on each side). They are numbered from 423 001 to 423 462.

Both Munich and Frankfurt ordered Class 423s for their S-Bahn systems; they were delivered between 1999 and 2004. The 423 has spawned a family of slightly modified designs ordered for S-Bahns across Germany: the Class 422, Class 424, Class 425/426 and Class 430.