 | This article needs additional citations for verification. (December 2019) |
| |
|---|---|
 Two Siemens SD-460 LRVs on St. Louis MetroLink | |
 Interior diagram of the Siemens SD-400 | |
| Manufacturer | Siemens Mobility |
| Built at | SD-400: Düsseldorf SD-460: Florin, California |
| Constructed | SD-400: 1985–1993 SD-460: 1999–2005 |
| Number built | SD-400: 86 SD-460: 68 |
| Operators | |
| Specifications | |
| Car length | 89.4 ft (27.25 m) |
| Width | 8.7 ft (2.65 m) |
| Height | 12.5 ft (3.81 m) |
| Maximum speed | 65 mph (105 km/h) |
| Weight | SD-400: 89,560 lb (40,620 kg) SD-460: 92,500 lb (42,000 kg) |
| Traction system | SD-400: Siemens chopper control SD-460: Siemens IGBT-VVVF |
| Traction motors | 4 × 200 hp (149 kW) SD-400: DC motor SD-460: 3-phase AC induction motor |
| Power output | 800 hp (597 kW) |
| Acceleration | 3 mph/s (4.8 km/(h⋅s)) |
| Deceleration | 3 mph/s (4.8 km/(h⋅s)) (service) |
| Electric system(s) | Overhead line 650–750 V DC |
| Current collector(s) | Faiveley & Brecknell Willis pantographs |
| UIC classification | Bo'2'Bo' |
| AAR wheel arrangement | B-2-B |
| Coupling system | Tomlinson |
| Track gauge |
|
The Siemens SD-400 and SD-460 are light rail vehicles (LRV) that were manufactured by Siemens Mobility between 1985 and 2005 for the North and South American markets. The SD-400 was built under Siemens' joint venture with Duewag and assembled at both Duewag's factory in Düsseldorf, West Germany (Germany after reunification in 1990) and the Siemens factory in Florin, California. Siemens purchased Duewag in 1999 and the SD-460 was assembled entirely at the Siemens factory in California.
The primary difference between the models is that the older SD-400 uses direct current motors, while the newer SD-460 uses alternating current motors. Both models were built with a "high-floor" design and equipped with 3-4 doors on each side for level boarding at high-platform stations and one door with steps for boarding at street-level.
The SD-400 and SD-460 were manufactured and marketed alongside the older Siemens–Duewag U2 LRV and later the Siemens SD-100 and SD-160 vehicles. The U2, SD-100, and SD-160 all offered either level boarding at high-platform stations or steps for passenger loading at street level.
This model has been replaced by the Siemens S700 and S70, low-floor vehicles for passenger loading at street level and the Siemens S200, a high-floor LRV for level boarding at high-platform stations.