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DBAG Class 424

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DBAG Class 424

The Class 424 is a class of electric multiple units formerly used on the Hanover S-Bahn network. 16 units were reallocated for the Munich S-Bahn and 24 units for the Cologne S-Bahn. The trains were ordered for the new Hanover S-Bahn, which would serve Expo 2000 in Hanover.

The Class 424 are similar to Deutsche Bahn's Class 425 and Class 423 trainsets.

A Class 424 unit consists of four cars that share three jacobs bogies and can only be separated at maintenance facilities. The inner two cars are designated as Class 434. A 424 unit typically consists of the following cars, where x is the unit's number:

e.g. 424 037 + 434 037 + 434 537 + 424 537. Differences usually occur when the remains of partially destroyed units are combined to form one intact EMU.

They have no visual distinctions to the Class 425. However, the Class 424 has a lower maximum speed of 140 km/h compared to the 160 km/h of the Class 425. Aside from that, installed on the Class 424 trains have variable steps and extendable platforms to reduce the gap between train and platform, which isn't fitted to earlier Class 425 units.

In comparison to the Class 423, the Class 424 feature a comparatively low floor height of 78 cm (31 in) to allow step-free access on 76 cm (29.9 in) platforms. They also lack a third set of doorways in the center of each car.

The Class 424 vehicles were ordered for the new Hanover S-Bahn, which would serve Expo 2000 in Hanover. They were supposed to enter operation in 2000, which was then delayed due to technical issues. The transformers under the car body were not adequately protected and resulted in functional problems to the network signal and protection system. During the Expo 2000, borrowed Class 423 units from the Munich S-Bahn and Stuttgart S-Bahn were operated instead.

During large events such as the Hannover Messe, the fleet was often supported by Class 425 units from other regions. Eventually, the fleet was reinforced with Class 425, with 15 units for operation in the S5 to Paderborn. In 2008, the fleet was then completed with 13 Class 425 units of the 5th batch.

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