Siemens SD660

The Siemens SD660, originally known as the Siemens SD600, is a double-articulated, 70%-low-floor light rail vehicle (LRV) manufactured by Siemens Transportation Systems. It was the first low-floor light rail vehicle to be used in the United States. It first entered service in 1997 with its only operator, TriMet, on the MAX light rail system in Portland, Oregon, United States.

Siemens SD660 (Types 2 and 3)
A train of SD660s on the Steel Bridge in Portland, Oregon
Interior of an SD660
ManufacturerSiemens
Built atSacramento, California
Constructed1996–2005
Entered service1997
Number built79
Number in service79
SuccessorSiemens S70/S700
Fleet numbers
  • Type 2: 201–252
  • Type 3: 301–327
OperatorsTriMet
Specifications
Car length91.93 ft (28.02 m) over couplers
Width8.71 ft (2.65 m)
Height13 ft (4.0 m)
Floor height
  • High floor section: 3.22 ft (980 mm)
  • Low floor section: 1.18 ft (360 mm)
Low-floor70%
EntryLevel
Doors8 per car (4 per side)
Articulated sections3
Wheelbase5.90 ft (1,800 mm)
Maximum speed55 mph (89 km/h)
Weight108,000 lb (49 t)
Traction systemSiemens IGBT–VVVF
Traction motors4 × Siemens 175 kW (235 hp) 3-phase AC induction motor
Power output700 kW (940 hp)
Acceleration3 mph/s (1.3 m/s2)
Deceleration
  • 3 mph/s (1.3 m/s2) (service)
  • 5 mph/s (2.2 m/s2) (emergency)
Electric system(s)Overhead line, 750 V DC
Current collector(s)Pantograph
UIC classificationBo′+2′+Bo′
AAR wheel arrangementB-2-B
Minimum turning radius
  • 82.02 ft (25.00 m) (horizontal)
  • 820 ft (250 m) (crest vertical)
  • 1,150 ft (350 m) (sag vertical)
Coupling systemScharfenberg
Multiple working
  • Within type
  • With Bombardier Type 1
Track gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
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