Stadtwerke Frankfurt am Main

Car Specifics
Manufacturer/Model: Siemens/U4
Vehicle type: Bi-directional Articulated
Developed by: Siemens
Number of trucks: 3
Number of axles: 6
Note: This U4 car was designed strictly for operation on lines with high-level platforms

Body
Doors: Two double-leaf swing plug doors on both sides of each car
Seats: 63

Suspension, Propulsion, Braking
Trucks: Three (2 motored, 1 trailing truck)
Suspension: Bonded rubber springs (primary), Air Springs (Secondary)
Wheel base: 1900 mm
Wheel diameter: 720-640mm 
Track gauge: 4 feet, 8 1/2 inches (1435 mm) AA Standard
Motors:.Two motored trucks, each with two three-phase AC transverse drives
Propulsion control: 2 GTO PWM inverters for every 2 traction motors
Motor rating: 4 x 130 kW

Vehicle Capacity
Seated Load: 63
Design Load: 174

Vehicle Dimensions
Length over couplers:
Width: Car width: 2650 mm
Height (rail to floor): Entry area (870mm); articulation section (890 mm)
Empty weight per car: 37,400 kg

Vehicle Performance
Maximum design speed: 80 km/h
Service acceleration on level tangent track: 1.0 m/sē
Service braking on level tangent track: 1.6 m/sē
Emergency braking on level tangent track: 2.73 m/sē
Minimum horizontal curve radius: 25 m
Maximum cars/consist: 4

Electrical and Control Systems
Power Supply: 600/750 V DC (+ 20%, - 30%)

Updated September 04, 2000