British Rail Class 76

British Rail Class 76

Locomotive no. E26055 at Sheffield Victoria in 1969.
Type and origin
Power type Electric
Builder LNER Doncaster Works (prototype) BR Gorton Works
Serial number Doncaster 1914
Gorton 1008–1064
Build date 1941 (prototype), 1950–1953
Total produced 58
Specifications
Configuration Bo-Bo
AAR wheel arr B-B
UIC class Bo+Bo
Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Wheel diameter 4 ft 2 in (1.270 m)
Length 50 ft 4 in (15.34 m)
Loco weight 87 long tons 18 cwt (196,900 lb or 89.3 t)
87 long tons 18 hundredweight (89.3 t; 98.4 short tons)
Electric system(s) 1500 V DC Catenary
Current collection Pantograph, 2 off
Traction motors Metropolitan-Vickers 186, 4 off
Train heating Steam generator (14 locomotives)
Train brakes Vacuum, some later Dual Vacuum / Air
Performance figures
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)
Loco brakeforce 72 long tons-force (717 kN)
Career
Operators British Railways
Numbers 26000–26055; later E26000–26057; later 76001–76057
Axle load class LNER: RA 9
BR: RA 8
Locale Manchester–Sheffield–Wath line
Withdrawn 1970–1981

The British Rail Class 76, also known as Class EM1 (Electric Mixed-Traffic 1),[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.[1]

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.[2]

26000 Tommy was used alongside the other EM1 locomotives equipped with train heating boilers, in everyday service. It was withdrawn in March 1970 and scrapped at Crewe two years later,[3] 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.

Production locomotives

Two Class EM1 locomotives at Penistone in 1954

In 1950–1953, a further 57 locomotives were built at Gorton locomotive works, Manchester, to a modified design; these were also classified EM1.[4] There were also to have been 24 built at Darlington Works, but these were cancelled.[1] 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.[1]

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.

Named Class 76 locomotives[5]
Loco Name Named
26046 Archimedes May 1959
26047 Diomedes September 1960
26048 Hector March 1960
26049 Jason August 1960
26050 Stentor August 1960
26051 Mentor June 1959
26052 Nestor August 1961
26053 Perseus October 1960
26054 Pluto April 1961
26055 Prometheus June 1959
26056 Triton July 1959
26057 Ulysses April 1960
An EM1 under trial in Essex in 1950

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.[6][7]

Brakes and controls

The locomotives were fitted with air brakes[2] 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.[8] Rheostatic braking was also fitted several years later as an additional safety precaution; this was effective below 20 mph (32 km/h).[8] Train brakes were operated by vacuum.[2] From November 1968, thirty of the locomotives were modified for multiple unit (M.U.) control.[9] 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.[10] 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.[9] 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.[11] 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.[2] Beyond the Woodhead Line, the trains to Fiddlers Ferry were diesel-hauled west of Manchester.

Liveries

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.

Class 76s at Reddish locomotive depot in 1981 shortly before withdrawal.

Withdrawal

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 and yet one of the most reliable classes on account of robust design 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. Most were still entirely serviceable when withdrawn. Apparently the Netherlands Railways were interested in their purchase for their heavy freight trains mainly from the North Sea Europoort inland following a good service record of the protype 6000 (Tommy). But controversy regarding the closure of the Woodhead line, BR's policies and of the government of the day plus BR's intention to avoid embarrassment regarding a sale for farther use thus discrediting their claims of expired working life from their traction policies as it happened back with the sale of the class 77 as well the greater age of the class 76s compared with the class 77s back in 1968 didn't result in sale for further service. 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.

Preservation

One locomotive has been preserved by the National Railway Museum along with at least one cab from another locomotive; 76039 at Museum of Science and Industry (MOSI) in Manchester.

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.

Models

Class 76 is being made as a kit and a ready-to-run model in OO gauge by Silver Fox Models.[12]

See also

Notes

  1. 1 2 3 4 Boddy et al. 1990, p. 100
  2. 1 2 3 4 Boddy et al. 1990, p. 107
  3. ↑ Nicholson, Christopher (September 2014). "Over the Woodhead in the cab of Tommy". The Railway Magazine 160 (1,362): 43–47. ISSN 0033-8923.
  4. ↑ Boddy et al. 1990, pp. 100–1
  5. ↑ Strickland 1983, p. 122
  6. ↑ Boddy et al. 1990, figs. 130, 147; pp. 102, 112
  7. ↑ Gradient Profiles 2003, E9
  8. 1 2 Boddy et al. 1990, p. 108
  9. 1 2 Boddy et al. 1990, pp. 108–9
  10. ↑ Boddy et al. 1990, pp. 109–111
  11. ↑ Boddy et al. 1990, p. 109
  12. ↑ "Class 76 EM1 Bo-Bo LNER Doncaster/BR Gorton". Retrieved 17 November 2012.

References

Further reading

External links

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