British Rail Class 27
||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (January 2014)|
|BRCW Type 2
British Rail Class 27
27001 at Bo’ness
|Type and origin|
|Builder||Birmingham Railway Carriage and Wagon Company|
|Gauge||4 ft 8 1⁄2 in (1,435 mm) standard gauge|
|Wheel diameter||3 ft 7 in (1.092 m)|
|Minimum curve||5 chains (100 m)|
|Wheelbase||39 ft 0 in (11.89 m)|
|Length||50 ft 9 in (15.47 m)|
|Width||8 ft 10 in (2.69 m)|
|Height||12 ft 8 in (3.86 m)|
|Locomotive weight||Originally: 72.50 long tons (73.7 t; 81.2 short tons)
71–76 tonnes (70–75 long tons; 78–84 short tons)
|Fuel capacity||685 imp gal (3,110 l; 823 US gal)|
|Prime mover||Sulzer 6LDA28-B|
|Traction motors||four GEC WT459 DC traction motors|
|Multiple working||★ Blue Star|
|Maximum speed||90 mph (145 km/h)|
|Power output||Engine: 1,250 hp (932 kW) @750 rpm
At rail: 933 horsepower (696 kW)
|Tractive effort||Maximum: 42,000 lbf (187 kN)
Continuous: 25,000 lbf (111 kN)
|Train heating||As built, Steam generator
subclass 27/2, Electric Train Heating, Houchin 120 kW (160 hp) alternator powered by Deutz 8-cylinder air-cooled diesel engine, type F8L413
|34 long tons-force (340 kN)|
|Train brakes||Initially 14 dual-braked, 10 fitted with additional air brakes later on. Remainder vacuum only.|
|Number(s)||D5347–D5415; later 27001–27066|
|Axle load class||Route availability 6 (RA 5 from 1969)|
British Rail's Class 27 comprised 69 diesel locomotives built by the Birmingham Railway Carriage and Wagon Company (BRCW) during 1961 and 1962. They were a development of the earlier Class 26; both were originally classified as the BRCW Type 2.
Original allocations were D5347 - 5369 to Glasgow Eastfield, D5370 - 5378 to Thornaby and D5379 - 5415 to London Cricklewood for Tilbury Boat trains and Cross-London freight services. In the period September to December 1963, some of the Cricklewood allocation were transferred to Leicester and in December 1965 the Thornaby allocation was also nominally transferred to Leicester to join them. Traffic changes combined with reallocation of Class 25s led to the gradual transfer of the Leicester and Cricklewood locomotives to Scotland during 1969 thus concentrating the whole class within Scotland and being part of the replacement fleet that allowed the withdrawal of the poorly performing Clayton Class 17 locomotives from traffic. For many years they were extensively used on the West Highland Line. By September 1986, the final vacuum brake only locos had been withdrawn, regular passenger services had ceased and only 21 locos remained, allocated entirely to Eastfield depot. A mass withdrawal in July 1987 due to the presence of blue asbestos left 27008 as the last in service. Its final working was on 13 August and the loco was officially withdrawn on 19 August 1987. The Class 27s were actually outlived by the older Class 26s, whose less powerful engines were more reliable.
- 27/0: Locomotives as built with steam heating (excluding 27024 - 27031)
- 27/1: Locomotives converted in 1970 for push pull operation, converted back to 27/0 after 1979.
- 27/2: Locomotives converted in 1970 with Electric Train Heat, converted back to 27/0 after 1979.
Edinburgh-Glasgow push-pull operation
By the late 1960s, the Swindon-built Inter City DMUs operating the Edinburgh Waverley - Glasgow Queen Street express service were becoming unreliable. They were replaced in 1971 by specially adapted Class 27s fitted with push-pull equipment to “top and tail” rakes of six Mark 2 carriages which were specially fitted with air operated disc brakes. At one end would be a Class 27/1, at the other a Class 27/2 (which provided train heating). The very intensive 90 mph (140 km/h) “push-pull” service was demanding on the locomotives and reliability started to suffer. The 27/2s, especially, appeared prone to fire damage, especially from their electric train heating alternators. The push-pull sets were replaced in 1980 by single Class 47/7s at one end of a rake of Mark 3 carriages and a DBSO. The Class 27/1s and 27/2s were then renumbered to 27/0 and could often be found on Edinburgh-Dundee semi-fast passenger services, until their replacement, briefly by class 101 and then Class 150 Sprinter DMUs in 1987, whilst the remainder were largely used on freight.
Accidents and incidents
- On 30 June 1962, locomotive D5386 was in a minor collision with a diesel multiple unit at Cricklewood carriage sidings, London due to confusion over a hand signal.
- Locomotive 27 044 was severely damaged by fire before 5 September 1980. It was consequently withdrawn and scrapped.
(current in bold)
|D5347||27001||BR Blue||Bo'ness and Kinneil Railway|
|D5351||27005||BR Blue||Bo'ness and Kinneil Railway|
|D5353||27007||BR Green||Mid-Hants Railway|
|D5370||27024||BR Green (Yellow Warning Panels)||Caledonian Railway (Brechin)|
|D5394||27050||27106||5394||BR Blue||Strathspey Railway|
|D5401||27056||27112||BR Green||Great Central Railway|
|D5410||27059||27123||27205||BR Green||Severn Valley Railway|
|D5386||27066||27103||27212||BR Blue||Dean Forest Railway|
- Harris, Roger (1985). The Allocation History of BR Diesels and Electrics (2nd ed.). Bromsgrove: Roger Harris.
- Marsden, Colin J. (1981). Motive power recognition:1 Locomotives. Shepperton: Ian Allan Ltd. ISBN 0-7110-1109-5.
- Oakley, Michael (1981). BR Class 26/27 Diesels. Truro: D Bradford Barton. ISBN 0-85153-418-X.
- Tayler, A.T.H (1984). BR Locomotives:2 Sulzer Types 2 and 3. Ian Allan Ltd. ISBN 0-7110-1340-3.
- Williams, Alan; Percival, David (1977). British Railways Locomotives and Multiple Units including Preserved Locomotives 1977. Shepperton: Ian Allan Ltd. ISBN 0-7110-0751-9.
- Ian Allan ABC of British Railways Locomotives, 1983 edition
|Wikimedia Commons has media related to British Rail Class 27.|
- Scottish Railway Preservation Society home to 27001 and 27005
- Mid Hants Railway home to 27007
- Caledonian Railway Diesel Group, owners of 27024
- Owners of 27056 based at the Great Central Railway
- Severn Valley Railway home to 27059
- Owners of 27066 based at the Dean Forest Railway