Siemens SD-400 and SD-460

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Siemens SD-400/SD-460 LRV
St Louis Metrolink train.jpg
A Siemens SD-460 LRV from Bi-State Transit departs Union Station, on the St. Louis's MetroLink system
August 2009 Pittsburgh LRT Interior.jpg
An interior of a Siemens SD-400 operating on the Pittsburgh T system.
Manufacturer Siemens-Duewag AG

SD-400: 1985–1993

SD-460: 1999–2005
Number built

SD-400: 86

SD-460: 68

SD-400: Port Authority of Allegheny County
Bi-State Development Agency

SD-460: Metro de Valencia
Bi-State Development Agency
Car length 89.4 feet (27.2 m)
Width 8.7 feet (2.7 m)
Height 12.5 feet (3.8 m)
Maximum speed 65 miles per hour (105 km/h)

SD-400: 89,560 pounds (40,620 kg)

SD-460: 92,500 pounds (42,000 kg)
Traction system

SD-400: Siemens DC-IGBT (x4)

SD-460: Siemens AC-IBGT (x4)
Power output 800 hp (597 kW)
Electric system(s) 750 v DC
Current collection method Pantograph
AAR wheel arrangement B-B-B
Track gauge 4 ft 8 12 in (1,435 mm) (St. Louis, Valencia),
5 ft 2 12 in (1,588 mm) Pennsylvania Trolley Gauge (Pittsburgh)

The Siemens SD-400 and SD-460 are electric light rail vehicles (LRV) built by Siemens Mobility, a division of Siemens AG. Both models have a common design, with frames built upon a B-B-B truck configuration mounted underneath a double-ended articulated body, which has a seating capacity for 72 people and room for an additional 106 standing passengers. There are four high-level, inward-opening "blinker" doors on each side of the vehicle for level boarding, along with an additional low-level, right-hand side doorway and steps at each end of the vehicle for low-level boarding.

Both the SD-400 and SD-460 are powered by four individual Siemens IGBT electric traction motors with each one developing 200 horsepower (149 kW) and creating a combined total power output of 800 horsepower (597 kW). The older SD-400 uses direct current (DC) motors, while the newer SD-460 uses alternating current (AC) motors. The SD-460 also uses updated electronic equipment compared to the SD-400. On both types, electric current is received via an overhead catenary wire, which supplies 750 volts into the motors.

More than 80 SD-400 units were produced between 1985 and 1993, with all being manufactured at Siemens' primary manufacturing plant at its home base in Germany,[1] while nearly 70 SD-460 units have been produced since 1999, with all being manufactured at Siemens' secondary manufacturing plant at their American base in California as opposed to Germany.[2] The SD-400 is used by the Port Authority of Allegheny County for the Pittsburgh Light Rail in Pennsylvania, while the SD-460 is used for the Valencia Metro in Venezuela. Both types are also used on the St. Louis MetroLink operated by Bi-State Transit in Missouri.

Original buyers[edit]


Operator (transit agency) Quantity Fleet Numbers Built/Notes
Port Authority of Allegheny County
Built 1985–87, refurbished 2005–06 and renumbered 4201–4255
Bi-State Transit of St. Louis
Built 1991–93
Total 86[3]


Operator (transit agency) Quantity Fleet Numbers Built/Notes
Metro de Valencia
Built 1999
Bi-State Transit of St. Louis
2001–2010, 3001–3024, & 4001–4022
Built 1999–2005
Total 68[4]

See also[edit]


  1. ^ Urban Rail Systems & Rosters
  2. ^ Urban Rail Systems & Rosters
  3. ^ Siemens Transportation Systems SD400 Vehicle Customers
  4. ^ "Vehicle Lines". Siemens. Archived from the original on 26 August 2012. Retrieved 13 July 2015. 

External links[edit]