Port Authority of Allegheny County operates 55 cars on an 22.5 mile system
Car Specifics
Manufacturer/Model: Siemens SD 400
Vehicle type: Double ended Articulated
Developed by:
Date in service:
Number of cars ordered: 55
Number of cars still in service (to date): Unknown
Number of trucks: 3
Number of axles: 6
Car Body
Manufacturer: Siemens Transportation Systems
Underframe: Low Alloy High Tensile Steel
Superstructure: Low Alloy High Tensile Steel
Interior Finish:
Floor: Rubber over Plywood
Steps:
Doors: Three High Level Doors and One Low Level Door per Side
Windows:
Seats: 62
Disabled Access: High Level Platforms / High Level Doors
Suspension, Propulsion, Braking
Trucks/Bogies:
Suspension: Rubber Chevron Springs (Primary), Air Spring System
(Secondary)
Truck centers:
Wheels:
Wheel base:
Track gauge: 62.5" (1,588 mm)
Motors: Dual DC-Chopper, Monomotor Two Motors per Car
Gear ratio: .
Gearbox: .
Slip/slide protection:
Service Brakes: Pneumatic Friction Brakes
Track Brakes:
Air compressor:
Traction Motor Rating: 205 kW (275 hp) (one hour rating, each motor)
Vehicle Capacity
Seated Load: 62
Design Load:
Crush Load:
Passenger Comfort
Heating: Baseboard
Air-conditioning: Compressor under car, condenser on top of car
Vehicle Dimensions
Length over couplers: 84 feet, 8 inches (25.81m)
Length over body ends:
Width: 8 feet, 9.6 inches (2.65m)
Height (rail to roof):
Height (rail to floor):
Pantograph operating range:
Empty weight per car: 85,800 lbs. (39,000 Kg)
Interior headroom: 6 feet, 9 inches
Interior width (articulated section):
Doorway width (minimum):
Doorway height:
Step height: None (High Level Platforms / High Level Doors)
Vehicle Performance
Maximum design speed: 50 mph
Maximum operating speed:
Maximum grade:
Service acceleration on level tangent track: 3.0 mphps
Service braking on level tangent track: 3.7 mphps
Emergency braking on level tangent track:
Minimum horizontal curve radius:
Minimum vertical curve radius:
Electrical and Control Systems
Power Supply: 650 Volts DC
Low voltage power supply: 16.5 volts
Interior Lights
Motor Control:
Amperage draw:
See the Siemens page for more information.
Updated May 26, 2000