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Specifications
Specifications
Configuration:;
• AAR	B-B
• UIC	Bo′Bo′
• Commonwealth	Bo-Bo
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Wheel diameter	4 ft 0 in (1.219 m)
Wheelbase	39 ft 6 in (12.04 m)
Length:;
• Over beams	53 ft 6+1⁄2 in (16.32 m)
Width	8 ft 8+1⁄4 in (2.648 m)
Height:;
• Pantograph	13 ft 0+9⁄16 in (3.977 m)
• Body height	12 ft 4+1⁄4 in (3.766 m)
Loco weight	76.60 long tons (77.83 t; 85.79 short tons)
Electric system/s	25 kV AC Catenary
Current pickup(s)	Pantograph
Traction motors	4 × GEC WT501
Gear ratio	25:74
Train heating	Electric Train Heating
Train brakes	Vacuum; Dual from 1972

Type and origin
Type and origin
Power type	Electric
Builder	North British Locomotive Company
Order number	L91
Build date	1960–1961
Total produced	10

British Railways AL4
British Rail Class 84
British Railways AL4; British Rail Class 84
	Preserved locomotive 84001 on display at Crewe Works open day on 11 September 2005
Power type
Type and origin
Power type	Electric
Builder	North British Locomotive Company
Order number	L91
Build date	1960–1961
Total produced	10
Configuration:;
Specifications
Configuration:;
• AAR	B-B
• UIC	Bo′Bo′
• Commonwealth	Bo-Bo
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Wheel diameter	4 ft 0 in (1.219 m)
Wheelbase	39 ft 6 in (12.04 m)
Length:;
• Over beams	53 ft 6+1⁄2 in (16.32 m)
Width	8 ft 8+1⁄4 in (2.648 m)
Height:;
• Pantograph	13 ft 0+9⁄16 in (3.977 m)
• Body height	12 ft 4+1⁄4 in (3.766 m)
Loco weight	76.60 long tons (77.83 t; 85.79 short tons)
Electric system/s	25 kV AC Catenary
Current pickup(s)	Pantograph
Traction motors	4 × GEC WT501
Gear ratio	25:74
Train heating	Electric Train Heating
Train brakes	Vacuum; Dual from 1972
Maximum speed
Performance figures
Maximum speed	100 mph (160 km/h)
Power output:;
• 1 hour	4 × 890 hp (660 kW)
• Continuous	4 × 750 hp (560 kW)
Tractive effort	50,000 lbf (220 kN)
Brakeforce	65.5 long tons-force (653 kN)
Operators
Career
Operators	British Rail
Numbers	E3036–E3045; later 84001–84010
Axle load class	Route availability 6
Retired	1979–1980
Disposition	One preserved, remainder scrapped

The British Rail Class 84 was a 25 kV AC electric locomotive that operated on the West Coast Main Line (WCML) of the London Midland Region.

The ten strong class was one of five prototype classes of electric locomotives built in the early stages of WCML electrification. Built between 1960 and 1961, the type was not a success, as they were beset by technical problems, and after several lengthy periods of storage, and unsuccessful attempts at resolving these problems, British Rail decided to withdraw the entire fleet between 1977 and 1980.

History

As part of the modernisation of the West Coast Main Line, which included electrification, 100 locomotives of five types were acquired from different manufacturers. Ten Class AL4 locomotives numbered E3036 - E3045 were built in 1960 by the North British Locomotive Company in Springburn, Glasgow, to a design by GEC.^[4]

Locomotive E3040 worked the inaugural AC electric-hauled train from Manchester Piccadilly to Crewe on 12 September 1960.^[2]

Power supply

The locomotives always worked on power provided by overhead catenary energised at 25,000 V AC. However, the main transformer, normally operated with the four windings in series, could be operated at 6250V AC with the transformer windings in parallel. This voltage was initially to be used where limited clearances gave concern over use of the higher voltage. Since the clearances were found to be adequate, the lower voltage connections were locked out of use.^[5]

Service

Once in service a number of problems emerged with the class, including rough riding, flashovers in the transformer windings, short lifespans for the motor spring drives, and major problems with the mercury-arc rectifiers. In April 1963 the entire fleet was temporarily taken out of service, and was returned to GEC Dukinfield, the builder of the electrical equipment, in an attempt to find a solution, and remedial work was carried out.^[6]^[7]

When the class returned to service, the problems persisted, and in 1967 they were placed into storage, using the former steam shed at Bury,^[8] along with Class AL3.^[9] During this time E3043 went to Rugby Testing Centre for trials.^[10]

Reprieve and rebuilding

The persistent problems could have been the end of the ten locomotives of Class 84, but the extension of the West Coast Main Line electrification to Glasgow meant that more electric locomotives would be needed. It was therefore decided that the stored Class AL3 and AL4 locomotives would be repaired, and returned to service which was conducted at Doncaster.^[10]

After spending five years in storage, all ten locomotives were rebuilt with silicon rectifiers and dual brakes in 1972.^[1]^[11] and were reclassified under TOPS as Class 84, being renumbered 84001 - 84010.

Withdrawal

The second rebuild overcame some of the previous problems, however new problems emerged involving traction motor failures, caused in part by the long period they had spent in storage, and the class continued to give trouble in service. By the mid-1970s, having already spent a substantial amount of money on them, British Rail could not justify any further investment in the fleet, especially since the recently introduced Class 87s allowed them to be sidelined. The decision was taken to withdraw them from service, with 84005 and 84007 being the first to be withdrawn in April 1977, the last to be withdrawn were 84003 and 84010 in 1980.^[6]^[7]^[12]

After withdrawal

Several of the locomotives were saved from scrap: 84001 was donated to the National Railway Museum for preservation. 84002 and 84010 were returned to GEC for a proposed scheme to use them as new-technology test bed locomotives, however this project never materialised, and both were scrapped in December 1982.^[12]

84009 saw further use in a new guise; it passed to the British Rail Research Division, and was rebuilt as an unpowered mobile load bank tester, to test the power supply to new and upgraded overhead line equipment, and was renumbered as ADB968021. In 1992 it was withdrawn from service and broken up.^[6] 84003, was saved to be used as a source of spares for 84009 and for possible conversion to departmental use, but was scrapped in 1986.^[12]

Preservation

One locomotive (84001) has been preserved by the National Railway Museum: This was initially meant to be temporary; the locomotive was to be exchanged at a later date for a more representative example of WCML electric traction such as a Class 86 or Class 87.^[12] It was later on loan to the Scottish Railway Museum, Bo'ness.^[13]

Fleet details

Key:	Preserved	Scrapped

Numbers^[1]			Date Introduced^[1]	Withdrawn^[14]^[15]	Disposal
Pre-TOPS	TOPS	NBL Works No.	Date Introduced^[1]	Withdrawn^[14]^[15]	Disposal
E3036	84001	27793	March 1960	22 January 1979^[1]	Preserved by the National Railway Museum.^[13]
E3037	84002	27794	May 1960	September 1980	Scrapped at Texas Metals
E3038	84003	27795	June 1960	November 1980	To Research Department Scrapped at Vic Berry, Leicester
E3039	84004	27796	July 1960	12 November 1977^[1]	Scrapped at Birds, Long Marston
E3040	84005	27797	August 1960	20 April 1977^[1]	Scrapped at Birds, Long Marston
E3041	84006	27798	October 1960	January 1978	Scrapped by J Cashmore at Crewe Yard
E3042	84007	27799	October 1960	April 1977	Scrapped by J Cashmore at Crewe Yard
E3043	84008	27800	December 1960	October 1979	Scrapped at Crewe Works
E3044	84009	27801	December 1960	3 August 1978^[1]	To Research Department Scrapped at Gwent Demolition, Margam
E3045	84010	27802	March 1961	November 1980	Scrapped at Texas Metals

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Webb & Duncan 1979, p. 59
^ ^a ^b ^c ^d ^e ^f ^g Webb & Duncan 1979, p. 58
^ ^a ^b ^c ^d Webb & Duncan 1979, p. 54
^ Marsden & Fenn 2001, p. 82
^ Allan 1968, p. 11.
^ ^a ^b ^c Marsden, Colin J. (2007). The AC Electrics. Ian Allan Publishing Ltd. pp. 38–41. ISBN 978-0-86093-614-5.
^ ^a ^b Morrison, Colin (2014). AC Electric Locomotives. Ian Allan Publishing Ltd. pp. 16–18. ISBN 978-0-7110-3505-8.
^ Railway World December 1967, p. 554.
^ Longhurst 1979, Class AL4–84
^ ^a ^b Marsden & Fenn 2001, p. 83
^ Webb & Duncan 1979, p. 55
^ ^a ^b ^c ^d "Class History - AL4 / 84". The AC Locomotive Group. Archived from the original on 29 January 2023. Retrieved 29 January 2023.
^ ^a ^b @RailwayMuseum (26 January 2023). "Class 84, 84001, made the short trip from Holgate Engineering Works to the NRM via platform 11" (Tweet) – via Twitter.
^ "The Class 84 Fleet". Rail Blue. Archived from the original on 3 July 2016. Retrieved 11 February 2016.
^ "Class 84". RAIL. No. 88. EMAP National Publications. January 1989. p. 42. ISSN 0953-4563. OCLC 49953699.

Sources

Longhurst, Roly (1979). Electric Locomotives of the West Coast Main Line. Truro: D. Bradford Barton Ltd. ISBN 0851533558. OCLC 16491712.
Marsden, Colin J.; Fenn, Graham B. (2001). British Rail Main Line Electric Locomotives (2nd ed.). Oxford Publishing Co. ISBN 9780860935599. OCLC 48532553.
Webb, Brian; Duncan, John (1979). AC Electric Locomotives of British Rail. David & Charles. ISBN 9780715376638. OCLC 6916046.
"British Railways Motive Power Survey". British Rail Locomotives and other motive power: Combined volume. London: Ian Allan. 1968. ISBN 0-7110-0008-5.

External links

"The AC Locomotive Group (caring for Class 84 84001)"

[WebbDuncan59-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Webb & Duncan 1979, p. 59

[WebbDuncan58-2] ^ ^a ^b ^c ^d ^e ^f ^g Webb & Duncan 1979, p. 58

[WebbDuncan54-3] Webb & Duncan 1979, p. 54

[MarsdenFenn82-4] Marsden & Fenn 2001, p. 82

[FOOTNOTEAllan196811-5] Allan 1968, p. 11.

[Marsden-6] Marsden, Colin J. (2007). The AC Electrics. Ian Allan Publishing Ltd. pp. 38–41. ISBN 978-0-86093-614-5.

[Morrison-7] Morrison, Colin (2014). AC Electric Locomotives. Ian Allan Publishing Ltd. pp. 16–18. ISBN 978-0-7110-3505-8.

[8] Railway World December 1967, p. 554.

[Longhurst-9] Longhurst 1979, Class AL4–84

[MarsdenFenn83-10] Marsden & Fenn 2001, p. 83

[WebbDuncan55-11] Webb & Duncan 1979, p. 55

[ACLG-12] "Class History - AL4 / 84". The AC Locomotive Group. Archived from the original on 29 January 2023. Retrieved 29 January 2023.

[BonessReturn-13] @RailwayMuseum (26 January 2023). "Class 84, 84001, made the short trip from Holgate Engineering Works to the NRM via platform 11" (Tweet) – via Twitter.

[14] "The Class 84 Fleet". Rail Blue. Archived from the original on 3 July 2016. Retrieved 11 February 2016.

[15] "Class 84". RAIL. No. 88. EMAP National Publications. January 1989. p. 42. ISSN 0953-4563. OCLC 49953699.

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PROFILPELAJAR.COM

British Rail Class 84

History

Power supply

Service

Reprieve and rebuilding

Withdrawal

After withdrawal

Preservation

Fleet details

References

Sources

Further reading

External links

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