'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 to the Scottish Region, the Eastern Region, and the London Midland Region, but all soon ended up in Scotland. For many years they were extensively used on the West Highland Line. The last locomotives were withdrawn from service in 1987, being outlived by the older Class 26s, whose less powerful engines were more reliable.
By the late 1960s, the Class 126
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 2a carriages. At one end would be a Class 27/1, at the other a Class 27/2 (which provided train heating). The very intensive “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 ETH 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 27s were then transferred for use on Edinburgh-Dundee semi-fast passenger services, until their replacement by Class 150
Sprinter DMUs in 1987.
- Introduced: 1961
- Weight: 71-76 tonnes
- Engine: Sulzer 6LDA28-B of at 750 rpm
- Transmission: Electric, four GEC WT459 traction motors
- Maximum tractive effort:
- Driving wheel diameter:
- Coupling code: Blue star (electro-pneumatic)
- Train heating:
Eight locomotives have been preserved.
- Marsden, Colin J. Motive power recognition:1 Locomotives. Shepperton: Ian Allen Ltd.
- Oakley, Michael BR Class 26/27 Diesels. Truro: D Bradford Barton.
- Tayler, A.T.H BR Locomotives:2 Sulzer Types 2 and 3. Ian Allan Ltd.
- Williams, Alan; Percival, David British Railways Locomotives and Multiple Units including Preserved Locomotives 1977. Shepperton: Ian Allen Ltd.
- Ian Allan ABC of British Railways Locomotives, 1983 edition