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The Siemens-Düwag U2 is a type of light-rail vehicle (LRV). The cars were built by consortium of Siemens, Wegmann & Co. and Düwag. The U2 design was built on the Siemens U1 prototype tram built in 1965 (now stored at a Frankfurt tram museum).
Originally designed for and used by the Frankfurt U-Bahn (subway/metro system), the model of car was adopted for light-rail use by transit systems in Edmonton, Calgary, and San Diego, during a period in which few purpose-built trams were being manufactured. All U2 cars were built between 1968 and 1990.
The U2's dimensions are 24.284 m (79 ft 8.1 in) by 2.650 m (8 ft 8.3 in) by 3.66 m (12 ft 0 in). The articulated halves of each car can be seen as a married pair; in the US, usually up to three such 'pairs' run together. Each articulated car has a total passenger capacity of 264 passengers. It may be equipped with two DC motors for a total power output of 300 kW (400 hp) and a maximum speed of 80 km/h (50 mph), or with four AC motors for an output of 544 kW (730 hp) and speed of 88 km/h (55 mph).
Frankfurt U2 cars use Scheren (diamond) or single-arm (z-shaped) pantographs, while Calgary, Edmonton and San Diego vehicles use a single-arm (z-shaped) pantograph.
- Manufacturer: Düwag Düsseldorf, West Germany
- Type: Double-ended articulated car, 6 axle, multiple-unit operation
- Height: 12.4 feet (3,780 mm)
- Width: 8.7 feet (2,652 mm)
- Length: 76 feet (23.165 m), 76.71 feet (23.381 m) or 88.5 feet (26.975 m)
- Weight (empty): 77,161 pounds (35,000 kg), 89,000 pounds (40,370 kg) or 97,900 pounds (44,407 kg)
- Car Body: Lightweight welded steel
- Wheels: Steel-tired with acoustic dampening
- Dynamic Braking
- Speed: 50 to 55 mph (80.5 to 88.5 km/h)
- Overhead Traction Power: 600 V DC
Siemens–Düwag Type U3 is an upgraded version of the U2 with a slightly longer length and cosmetic changes. Introduced in 1977, they entered service in 1980 and were never exported outside of Germany's Frankfurt U-Bahn.
Siemens–Düwag Type U2A on Sacramento Regional Transit's light rail system is an upgraded version of the U2 that shares similar characteristics of the newer SD-100s and SD-160s, yet it still uses the mechanical equipment of the U2.
U2 cars acquired, by city
U2a cars acquired, by city
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