British Rail Class 27

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BRCW Type 2
British Rail Class 27
27001 in Bo'ness Yard.jpg
27001 at Bo’ness
Specifications
Power typeDiesel-electric
BuilderBirmingham Railway Carriage and Wagon Company
Serial numberDEL190–DEL258
Build date1961–1962
Total produced69
ConfigurationBo-Bo
UIC classificationBo'Bo'
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter3 ft 7 in (1.092 m)
Minimum curve5 chains (100 m)
Wheelbase39 ft 0 in (11.89 m)
Length50 ft 9 in (15.47 m)
Width8 ft 10 in (2.69 m)
Height12 ft 8 in (3.86 m)
Locomotive weightOriginally: 72.50 long tons (73.7 t; 81.2 short tons)
71–76 tonnes (70–75 long tons; 78–84 short tons)
Fuel capacity685 imp gal (3,110 l; 823 US gal)
Prime moverSulzer 6LDA28-B
GeneratorDC
Traction motorsfour GEC WT459 DC traction motors
TransmissionDiesel electric
Multiple working Blue Star
Top speed90 mph (145 km/h)
Power outputEngine: 1,250 hp (932 kW) @750 rpm
At rail: 933 horsepower (696 kW)
Tractive effortMaximum: 42,000 lbf (187 kN)
Continuous: 25,000 lbf (111 kN)
Train heatingAs 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
Locomotive
brakeforce
34 long tons-force (340 kN)
Train brakesInitially 14 dual-braked, 10 fitted with additional air brakes later on. Remainder vacuum only.
Career
Railroad(s)British Railways
NumberD5347–D5415; later 27001–27066
Axle load classRoute availability 6 (RA 5 from 1969)
First run1961
 
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BRCW Type 2
British Rail Class 27
27001 in Bo'ness Yard.jpg
27001 at Bo’ness
Specifications
Power typeDiesel-electric
BuilderBirmingham Railway Carriage and Wagon Company
Serial numberDEL190–DEL258
Build date1961–1962
Total produced69
ConfigurationBo-Bo
UIC classificationBo'Bo'
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter3 ft 7 in (1.092 m)
Minimum curve5 chains (100 m)
Wheelbase39 ft 0 in (11.89 m)
Length50 ft 9 in (15.47 m)
Width8 ft 10 in (2.69 m)
Height12 ft 8 in (3.86 m)
Locomotive weightOriginally: 72.50 long tons (73.7 t; 81.2 short tons)
71–76 tonnes (70–75 long tons; 78–84 short tons)
Fuel capacity685 imp gal (3,110 l; 823 US gal)
Prime moverSulzer 6LDA28-B
GeneratorDC
Traction motorsfour GEC WT459 DC traction motors
TransmissionDiesel electric
Multiple working Blue Star
Top speed90 mph (145 km/h)
Power outputEngine: 1,250 hp (932 kW) @750 rpm
At rail: 933 horsepower (696 kW)
Tractive effortMaximum: 42,000 lbf (187 kN)
Continuous: 25,000 lbf (111 kN)
Train heatingAs 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
Locomotive
brakeforce
34 long tons-force (340 kN)
Train brakesInitially 14 dual-braked, 10 fitted with additional air brakes later on. Remainder vacuum only.
Career
Railroad(s)British Railways
NumberD5347–D5415; later 27001–27066
Axle load classRoute availability 6 (RA 5 from 1969)
First run1961

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.

Working life[edit]

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 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.

Edinburgh-Glasgow push-pull operation[edit]

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 spare Class 27/1s were then transferred for use on Edinburgh-Dundee semi-fast passenger services, until their replacement by Class 150 Sprinter DMUs in 1987, whilst the 27/2 subclass was largely used on freight. Their ETH supply was no longer used.

Preserved locomotives[edit]

Eight examples of the class have been preserved at various heritage railways in Great Britain.[1]

Numbers
(current in bold)
LiveryLocation
D534727001BR BlueBo'ness and Kinneil Railway
D535127005BR BlueBo'ness and Kinneil Railway
D535327007BR GreenMid-Hants Railway
D537027024BR Green (Yellow Warning Panels)Lakeside and Haverthwaite Railway
D539427050271065394BR BlueStrathspey Railway
D54012705627112BR GreenGreat Central Railway
D5410270592712327205BR GreenSevern Valley Railway
D5386270662710327212BR BlueDean Forest Railway
27066 on the Dean Forest Railway
D5401 (27056) at the Great Central Railway


References[edit]

  1. ^ "Preserved Diesels - Class 27". Retrieved 2009-10-28. 

Literature[edit]

External links[edit]