DB BR 423 (TS)

* DB 423 (Rhein Main)
* Interior (Rhein Main)
* Cab (Rhein Main)

The multiple units of the **series 423** are S - Bahn multiple units that have replaced the predecessor DB series 420 since 1998 . The vehicles were originally designed for the Munich S-Bahn , but are also used on the Cologne S-Bahn , the Stuttgart S-Bahn and the Rhein-Main S-Bahn .

## Description

The four-car multiple units of the 423 series are 67.40 meters long. The multiple unit is designed for S-Bahn operations and therefore does not have a toilet. As a lightweight vehicle, it is largely made of aluminum . Three- phase current technology with regenerative braking is used as the drive , the output is 2350  kilowatts . The maximum permissible speed of the multiple unit is 140 km/h.
Schematic side view of a class 423 S-Bahn multiple unit
A "short train" of the 423 series consists of four cars :

1. End railcar (ETW) 1: 423 001 – 462
2. Medium railcar (MTW) ​​2: 433 001 – 462
3. Middle railcar (MTW) ​​3: 433 501 – 962
4. End railcar (ETW) 4: 423 501 – 962

When delivered, the serial numbers of the individual cars are always based on the same scheme; the two front cars have the same serial number, while the two rear cars have the serial number increased by 500.

Two short trains form a "full train", three short trains form a "long train".
View of the passenger compartment
One can see through from end to end of the vehicle, the original design having a lockable door fitted in the middle of the motorcar, which was intended to allow part of the vehicle to be left empty during off-peak periods for greater social control to be obtained through dense occupancy. The railcars have a passenger information system (PIS) inside, which alternately displays the destination stop and the next stop and is supplemented by a one-time acoustic announcement of the next stop. Furthermore, an announcement is made as to which side it will be possible to exit. In addition, they are equipped with a system for technical clearance (TAV), whereby theTrain driver does not have to monitor the doors himself, this is done by light barriers . However, in 2007 this procedure was temporarily phased out pending the retrofitting of light curtains over almost the entire height of the boarding area (see door closure and light barriers ).

The vehicles differ from the similar-looking regional transport series 424 , 425 and 426 in that the car body is 180 millimeters wider, three instead of two doors on each side of the car, the missing toilet, a floor height of 1,025 millimeters above the top edge of the rails, which is 20 km/h lower Maximum speed and the possibility of being able to drive in triple traction at most (424-426: maximum quadruple traction). Driving and braking technology, on the other hand, are almost identical.

The triple headlights can be switched from low beam to high beam during operation . Some railcars (423 238 and 423 268 of the Munich S-Bahn) were used instead of normal beam headlights with LED headlights , in which the light from green and red LEDs was mixed to give a more balanced spectral distribution. With the modernization, all vehicles were converted to warm white LED modules.

The openings of the twelve doors per side  are 1300 mm wide.