DB Class 420
From Wikipedia, the free encyclopedia
| Baureihe 420 | |
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| Technical data | |
| Class number | 420/421 |
| Put into service (1st year) | 1971 |
| Manufacturers | MAN, WMD, LHB, MBB, O&K, Uerdingen, WU |
| Wheel arrangement | Bo'Bo'+Bo'Bo'+Bo'Bo' |
| Gauge: | 1435 mm |
| Length from buffer to buffer | 67.4 m (23.3 m + 20.8 m + 23.3 m) |
| Width | 3.08 m |
| Distance between pivots | 16.5 m in cab cars, 14 m in trailer |
| Bogie wheel base | 2.5 m |
| Wheel diameter | 0.85 m |
| Floor height | ca. 1 m |
| Weight empty | 129 t / 138 t depending on series |
| Max. load | 15 t / 24 t (depending on series |
| Voltage system | 15 kV, 16.7 Hz |
| Max. acceleration upon starting | 0.9 m/s2 |
| Braking deceleration from 120 km/h |
-0,9 m/s2 regular, -0,95 m/s2 at emergency stop |
| Normal tractive effort | 12 x 200 = 2400 kW |
| Maximum sustained speed at normal tractive effort |
72 km/h |
| Maximum speed | 120 km/h (reachable within 40 s) |
| Number of seats | 194 2nd class, 17 or 33 1st class (depending on series) |
| Total produced | 480 units |
The ET 420 is a light-weight commuter electric multiple unit developed for the S-Bahn networks in Germany and was originally commissioned by the Deutsche Bundesbahn for the Munich, Stuttgart and Frankfurt networks. It was built from 1971 onwards in several series, later changing the construction from steel to aluminium, making the cars more lightweight and able to carry a greater payload.
It has largely been replaced in said cities by its successor, the Class 423, but some units have been shipped to Stockholm and some have been transferred to the Rhine-Ruhr S-Bahn network. In Sweden the fifteen units received designation X420 serving on the Stockholm commuter rail, and were in service from 2001 until the arrival of the new X60-series in 2006-08.
Additionally, in the Rhine-Main Area, many units of class 420 are still in use, especially on lines S8 and S9 of the S-Bahn Rhein Main. Today all trains of this class have been repainted in the DB-typical "traffic red" (verkehrsrot).
Unit 421 001 will be preserved at the DB Museum in Nuremberg. Some 420/421 units in Stuttgart are currently being rebuilt by the ET 420 Plus project, adding air conditioning and passenger information displays to the trains among other things.
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