Bombardier–Alstom HHP-8

Specifications
Specifications
Configuration:;
• AAR	B-B
• UIC	Bo’Bo’
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Wheel diameter	40 in (1,016 mm)
Minimum curve	249 ft (76 m)
Wheelbase	9 ft 4 in (2.84 m)
• Truck	35 ft 3 in (10.74 m)
Length	67 ft 1 in (20.45 m) over couplers
Width	10 ft 4 in (3.15 m)
Height	14 ft 2 in (4.32 m)
Loco weight	222,000 lb (101 t)
Power supply	Overhead line
Electric system/s	25 kV 60 Hz AC; 12.5 kV 60 Hz AC; 12 kV 25 Hz AC;
Current pickup(s)	Dual pantographs
Traction motors	4 × 1.5 MW (2,000 hp) Alstom 4-FXA-4559C
Loco brake	Electrical: regenerative and rheostatic brakes; Friction: two disc brakes per axle;
Safety systems	Cab signals, ACSES

Type and origin
Type and origin
Power type	Electric
Builder	Bombardier, Alstom
Build date	1999 - 2001
Total produced	Amtrak: 15; MARC: 6

Bombardier–Alstom HHP-8
Bombardier–Alstom HHP-8
	MARC No. 4915 at Odenton in 2014
Power type
Type and origin
Power type	Electric
Builder	Bombardier, Alstom
Build date	1999 - 2001
Total produced	Amtrak: 15; MARC: 6
Configuration:;
Specifications
Configuration:;
• AAR	B-B
• UIC	Bo’Bo’
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Wheel diameter	40 in (1,016 mm)
Minimum curve	249 ft (76 m)
Wheelbase	9 ft 4 in (2.84 m)
• Truck	35 ft 3 in (10.74 m)
Length	67 ft 1 in (20.45 m) over couplers
Width	10 ft 4 in (3.15 m)
Height	14 ft 2 in (4.32 m)
Loco weight	222,000 lb (101 t)
Power supply	Overhead line
Electric system/s	25 kV 60 Hz AC; 12.5 kV 60 Hz AC; 12 kV 25 Hz AC;
Current pickup(s)	Dual pantographs
Traction motors	4 × 1.5 MW (2,000 hp) Alstom 4-FXA-4559C
Loco brake	Electrical: regenerative and rheostatic brakes; Friction: two disc brakes per axle;
Safety systems	Cab signals, ACSES
Maximum speed
Performance figures
Maximum speed	135 mph (217 km/h)
Power output	6,000 kW (8,000 hp) continuous
Tractive effort:;
• Starting	71,240 lbf (316.9 kN)
• Continuous	56,200 lbf (250.0 kN)
Operators
Career
Operators	Amtrak (formerly); MARC;
Numbers	Amtrak: 680-694 (formerly 650-664); MARC: 4910-4915;
Official name	HSEL (High Speed Electric Locomotive)
Retired	2014 (Amtrak)
Disposition	MARC units in service, Amtrak units stored. Some Amtrak units converted to NPCUs.
	Sources: except where noted

The Bombardier–Alstom HHP-8 (High Horse Power 8000) is a twin-cab electric locomotive built for Amtrak and MARC by a consortium of Bombardier and Alstom. Its electrical system was based on Alstom's BB 36000 locomotive.

Due to a limited number of locomotives produced and reliability issues leading to high maintenance costs, Amtrak retired all its HHP-8s after only 10 years of service. MARC initially planned to follow suit but ultimately chose to refurbish their HHP-8 fleet between 2017 and 2018.