British Rail Class 91

Specifications
Specifications
Configuration:;
• AAR	B-B
• UIC	Bo′Bo′
• Commonwealth	Bo-Bo
Gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Bogies	BREL BP52
Wheel diameter	970 mm (3 ft 2 in)
Minimum curve	80.000 m (262 ft 5.6 in)
Wheelbase	10.500 m (34 ft 5.4 in)
• Bogie	3.350 m (10 ft 11.9 in)
Length:;
• Over body	19.400 m (63 ft 7.8 in)
Width	2.740 m (8 ft 11.9 in)
Height	3.757 m (12 ft 3.9 in)
Loco weight	85.25 tonnes (83.90 long tons; 93.97 short tons);
Electric system/s	25 kV 50 Hz AC overhead
Current pickup(s)	Pantograph; (Brecknell Willis high speed);
Traction motors	4 × GEC G426AZ DC
Gear ratio	1.741:1
MU working	TDM
Train heating	Electric Train Supply, index 95; (1000 V, 600 A, max 475 kW);
Loco brake	Pneumatic (disc and tread) and rheostatic;
Train brakes	Pneumatic
Safety systems	AWS; TPWS;
Couplers	Drophead Buckeye

Type and origin
Type and origin
Power type	Electric
Designer	GEC Transportation Projects
Builder	BREL Crewe Works
Build date	1988–1991
Total produced	31
Rebuilder	Adtranz
Rebuild date	2000–2003
Number rebuilt	31

British Rail Class 91
British Rail Class 91
	LNER Class 91 at London King's Cross
Power type
Type and origin
Power type	Electric
Designer	GEC Transportation Projects
Builder	BREL Crewe Works
Build date	1988–1991
Total produced	31
Rebuilder	Adtranz
Rebuild date	2000–2003
Number rebuilt	31
Configuration:;
Specifications
Configuration:;
• AAR	B-B
• UIC	Bo′Bo′
• Commonwealth	Bo-Bo
Gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Bogies	BREL BP52
Wheel diameter	970 mm (3 ft 2 in)
Minimum curve	80.000 m (262 ft 5.6 in)
Wheelbase	10.500 m (34 ft 5.4 in)
• Bogie	3.350 m (10 ft 11.9 in)
Length:;
• Over body	19.400 m (63 ft 7.8 in)
Width	2.740 m (8 ft 11.9 in)
Height	3.757 m (12 ft 3.9 in)
Loco weight	85.25 tonnes (83.90 long tons; 93.97 short tons);
Electric system/s	25 kV 50 Hz AC overhead
Current pickup(s)	Pantograph; (Brecknell Willis high speed);
Traction motors	4 × GEC G426AZ DC
Gear ratio	1.741:1
MU working	TDM
Train heating	Electric Train Supply, index 95; (1000 V, 600 A, max 475 kW);
Loco brake	Pneumatic (disc and tread) and rheostatic;
Train brakes	Pneumatic
Safety systems	AWS; TPWS;
Couplers	Drophead Buckeye
Maximum speed
Performance figures
Maximum speed	Design:; 140 mph (225 km/h); Service:; 125 mph (201 km/h); No. 2 cab leading:; 110 mph (177 km/h); As light locomotive:; 75 mph (121 km/h);
Power output:;
• Starting	4.70 MW (6,300 hp) at rails
• Continuous	4.54 MW (6,090 hp) at rails
Tractive effort:;
• Starting	190 kN (43,000 lbf)
• Continuous	107 kN (24,000 lbf) at 95 mph (153 km/h);
Brakeforce	Rheostatic:; 83 kN (19,000 lbf) max.;
Operators
Career
Operators	Current:; London North Eastern Railway; Europhoenix; Former:; British Rail (InterCity); Great North Eastern Railway; National Express East Coast; East Coast (DOR); Virgin Trains East Coast;
Numbers	As built:; 91001–91031; Post 2000–2003 refit:; 91101–91122, 91124–91132;
Official name	Electra
Axle load class	Route availability 7
Current owner	Eversholt Rail Group; Europhoenix;
Disposition	In service: 12; Stored: 6; Scrapped: 12; Preserved: 1;

The British Rail Class 91 is a high-speed electric locomotive, which produces power of 4,830 kW (6,480 hp); it was ordered as a component of the East Coast Main Line modernisation and electrification programme of the late 1980s. The Class 91s were given the auxiliary name of InterCity 225 to indicate their envisaged top speed of 225 km/h (140 mph); they were also referred to as Electras by British Rail during their development and throughout the electrification of the East Coast Main Line.

The locomotive body shells are of all-steel construction. Unusually, the motors are body mounted and drive bogie-mounted gearboxes via cardan shafts; this reduces the unsprung mass and hence track wear at high speeds. The locomotive also features an underslung transformer, therefore the body is relatively empty compared to contemporary electric locomotives. Much of the engineering specification for the locomotive was derived from the research and operational experience of the APT-P.

The other end of the InterCity 225 train set is formed of a Mark 4 Driving Van Trailer, built with a similar body shell to the Class 91 locomotives but with only one driving cab.

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