Power transmission
Each coach rests on two twin-axle bogies. Only the bogie at the close-coupled end of the coach is driven. Power transmission from the motor is achieved using a "Voith" hydrodynamic transmission system with a converter ("Wandler") and a T 311r coupling. Up to Class 628, a T 320 double-converter transmission was used. Motor and transmission are suspended elastically under the lightweight coach body. The operating brake is an automatic compressed air KE disc brake with automatic load braking and electronic anti-skid protection. In addition, for rapid braking, electromagnetic rail brakes are used; these can also be activated separately if required.