British Rail Class 76
|British Rail Class 76|
Locomotive no. E26055 at Sheffield Victoria in 1969.
|Builder||LNER Doncaster Works (prototype) BR Gorton Works|
|Serial number||Doncaster 1914
|Build date||1941 (prototype), 1950–1953|
|AAR wheel arr.||B-B|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|Wheel diameter||4 ft 2 in (1.270 m)|
|Length||50 ft 4 in (15.34 m)|
|Locomotive weight||87 tons 18 cwt (196,900 lb or 89.3 t)|
|Electric system(s)||1500 V DC Catenary|
|Pantograph, 2 off|
|Traction motors||Metropolitan-Vickers 186, 4 off|
|Maximum speed||65 mph (105 km/h)|
|Power output||Continuous: 1,300 hp (969 kW)
One-hour: 1,868 hp (1,393 kW)
|Tractive effort||45,000 lbf (200,000 N)|
|Train heating||Steam generator (14 locomotives)|
|72 long tons-force (717 kN)|
|Train brakes||Vacuum, some later Dual Vacuum / Air|
|Number(s)||26000–26055; later E26000–26057; later 76001–76057|
|Axle load class||LNER: RA 9
BR: RA 8
The British Rail Class 76, also known as Class EM1 (Electric Mixed-Traffic 1), is a class of 1.5 kV DC, Bo+Bo electric locomotive designed for use on the now-closed Woodhead Line in Northern England.
Tommy — the prototype
The prototype, LNER No. 6701 was completed at Doncaster Works in 1941 to a design by Sir Nigel Gresley, but electrification of the Woodhead Route together with construction of 69 similar units was delayed by the Second World War. It was tested on the few sections of 1500 V DC lines owned by the LNER but had not worked any great distance by 1947 when it was loaned to Dutch Railways to help with their post war shortage of locomotives. In September 1945 the LNER assigned it the classification EM1; previously it had been unclassified.
The prototype locomotive, renumbered 6000 in June 1946, remained on Dutch Railways until 1952 when the Woodhead electrification was complete. While in the Netherlands it gained the name Tommy after the nickname given to British soldiers and ran for the rest of its working life with a name plate which included an explanation of the origin - "So named by drivers of the Netherlands State Railway to whom this locomotive was loaned 1947-1952". It was renumbered to 26000 following the formation of British Railways.
When new, the locomotive had Westinghouse air brakes, and dual air and vacuum brakes were provided for the train. For operations in the Netherlands, the vacuum brake equipment was disconnected. When returned to Britain, the vacuum brake was restored but the air brake for the train was removed.
26000 Tommy was used alongside the other EM1 locomotives equipped with train heating boilers, in everyday service. It was withdrawn and scrapped in 1971 when passenger services were withdrawn over the Woodhead route and several locomotives became surplus to requirements.
The time in the Netherlands had shown that the design did not ride well at high speed due to the bogie design. The buffers and couplings were mounted on the bogies which were then linked together by a drawbar, a feature intended to remove stress from the superstructure. It was also felt that the cabs were too small with poor visibility.
In 1950–1953, a further 57 locomotives were built at Gorton locomotive works, Manchester, to a modified design; these were also classified EM1. There were also to have been 24 built at Darlington Works, but these were cancelled. Electrical equipment was supplied by Metropolitan-Vickers, who completed the final assembly of the locomotives at Dukinfield Works. They were later reclassified as Class 76 under the TOPS classification scheme introduced on 28 March 1968.
The locomotives were fitted with twin diamond-shaped pantographs. At certain points on the Woodhead Line, notably in the vicinity of steam locomotive water-columns, the electric overhead lines were as high as 20 feet above the tracks. The pantographs (BR practice utilised both raised in normal Woodhead operation in order to maximise current collection under any weather condition) had to stretch to almost their full height to reach the wires at such points.
Although mainly intended for freight working, the locomotives also regularly worked Woodhead Line passenger services – especially after the sale of the Class 77 locomotives to the Netherlands Railways in 1968. Fourteen locomotives (26020, 26046–26057) being fitted with steam heating apparatus. Thirteen of these gained classical Greek names. The names were removed in 1970 after the discontinuance of passenger services in January of that year.
Brief stay in Essex
The first section of the Manchester to Sheffield "Woodhead" route, that between Dunford Bridge and Wath, was not electrified until 4 February 1952. The lines between London Liverpool Street and Shenfield had already been electrified in September 1949 using the same 1500 V DC system, and on 27 October 1950, the first two locomotives to be completed, nos. 26001 and 26002, were sent to Ilford depot in Essex for trials; these were joined in early 1951 by 26003–26010. The trials involved a variety of trains, passenger and freight, and included tests of the regenerative braking system on Brentwood bank, which has a gradient of 1:103 (0.97%). In June 1951, the ten locomotives were sent north to Wath, where the overhead lines had recently been energised, for further trials.
Brakes and controls
The locomotives were fitted with air brakes and regenerative braking; the latter, which could only be used at speeds between 16 and 55 mph (26 and 89 km/h), caused current to be fed back into the wires during the long descents on both sides of the Woodhead Tunnel, and so assisting any train which was ascending at the time. Rheostatic braking was also fitted several years later as an additional safety precaution; this was effective below 20 mph (32 km/h). Train brakes were operated by vacuum. From November 1968, thirty of the locomotives were modified for multiple unit (M.U.) control. This became particularly important from January 1970 with the introduction of "Merry-Go-Round" coal trains from South Yorkshire to Fiddlers Ferry Power Station near Widnes, operated by two Class 76s (and banked by two extra locomotives up the Worsborough incline between Wombwell and Silkstone). Such trains became the mainstay of the Woodhead Line in the 1970s. Locomotives fitted with M.U. control were also given train air brakes; the last nine conversions had their train vacuum brakes removed at the same time. A "Clearcall" intercom system was fitted, allowing communication between the drivers of the leading pair and the banking pair of locomotives via the overhead line. An early version of this system had been tried on six of the locomotives in the late 1950s, but had been abandoned as unsatisfactory following tests concluding 26 May 1960. Beyond the Woodhead Line, the trains to Fiddlers Ferry were diesel-hauled west of Manchester.
As delivered, the locomotives were painted black (as in the main photograph). From the late 1950s onwards Brunswick green was adopted, with small yellow warning panels on the cab ends. From the late 1960s until withdrawal, the Class 76s started to appear in British Rail monastral blue with yellow cab ends.
The fortunes of the Class 76s were inextricably tied to the fate of the Woodhead Line. The reduction of the freight traffic on the Woodhead Line, plus the ending of passenger services, resulted in the early withdrawal of several locomotives.
By the late 1970s the locomotives were amongst the oldest in service on British Rail and replacement would ultimately become necessary. However, the closure of the Woodhead Line between Hadfield in the West and Penistone in the East (July 1981) resulted in the withdrawal of the entire fleet.
Class 76 had served well, having been built to an evidently sound design and cared-for well by the maintenance teams of Reddish and Wath. Many were still entirely serviceable when withdrawn and British Rail sought to sell the fleet to the Netherlands Railways, but neither they nor any other operator of 1500 V dc railways wished to purchase the Class 76s - many of which were already over 30 years old. Accordingly the remaining locomotives were scrapped (many at the yards of Booths of Rotherham), apart from a single preserved example now in the National Railway Museum, York.
One locomotive has been preserved by the National Railway Museum along with at least one cab from another locomotive; 76039 at the Manchester MOSI.
The preserved locomotive, No. 26020 (later 76 020) was specially chosen because it was built with stainless steel handrails and had been exhibited at the Festival of Britain. Later, it was the locomotive that pulled the opening day train through the Woodhead Tunnel. It retains the stainless steel handrails, although they are currently painted over.
A complete cabside from No. 76039 Hector and a door from No. 76051 are preserved in original condition at Barrow Hill roundhouse.
Class 76 is being made as a kit and a ready-to-run model in OO gauge by Silver Fox Models.
- Boddy et al. 1990, p. 100
- Boddy et al. 1990, p. 107
- Boddy et al. 1990, pp. 100–1
- Strickland 1983, p. 122
- Boddy et al. 1990, figs. 130, 147; pp. 102, 112
- Gradient Profiles 2003, E9
- Boddy et al. 1990, p. 108
- Boddy et al. 1990, pp. 108–9
- Boddy et al. 1990, pp. 109–111
- Boddy et al. 1990, p. 109
- "Class 76 EM1 Bo-Bo LNER Doncaster/BR Gorton". Retrieved 17 November 2012.
- Boddy, M.G.; Fry, E.V.; Hennigan, W.; Hoole, Ken; Mallaband, Peter; Neve, E.; Price, J.H.; Proud, P.; Yeadon, W.B. (April 1990). Fry, E.V., ed. Locomotives of the L.N.E.R., part 10B: Railcars and Electric Stock. Lincoln: RCTS. ISBN 0-901115-66-5.
- Strickland, David C. (September 1983). Locomotive Directory. Camberley, Surrey: Diesel and Electric Group. ISBN 0-906375-10-X.
- BR Main Line Gradient Profiles: The Age of Steam. Hersham: Ian Allan. January 2003 . ISBN 0-7110-0875-2. 0301/A.
- McManus, Michael. Ultimate Allocations, British Railways Locomotives 1948 - 1968. Wirral. Michael McManus.
|Wikimedia Commons has media related to British Rail Class 76.|