L&YR Class 27
|L&YR Class 27|
27 class locomotive on the East Lancashire Railway
|Type and origin|
|Builder||L&YR, Horwich Works|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|Wheel diameter||5 ft 1 in (1.549 m)|
|Length||48 ft 6 in (14.78 m)|
|Locomotive weight||42 long tons 11 cwt (95,300 lb or 43.2 t)|
|Locomotive and tender
|69 long tons 3 cwt (154,900 lb or 70.3 t)|
|Boiler pressure||180 psi (1.24 MPa)|
|Cylinder size||18 in × 26 in (457 mm × 660 mm)|
|Valve gear||Joy valve gear|
|Tractive effort||21,130 lbf (94.0 kN)|
|Operator(s)||Lancashire and Yorkshire Railway|
|Power class||LMS & BR: 3F |
Construction and operation
Class 27 locomotives were designed by John Aspinall and 484 were built between 1889 - 1918 at Horwich Works. It was the standard goods engine used by the Lancashire & Yorkshire Railway. Aspinall opted for a two-cylinder format with a non superheated round top boiler. David Joy's configuration of valve gear was employed. By the time Aspinall became general manager of the L&YR on 1 July 1899 more than 400 of the simple but powerful engines had been built. More were built under his successors, Henry Hoy and George Hughes, albeit with some modifications. By 1918 there were the 484 locomotives in the class.
Under Hughes, one of the class was subject to early experiments in superheating, the process of increasing the temperature of steam produced in the boiler so the minimum of energy was lost. After months of trials, 20 superheated engines were authorised to be built and the first of the superheated class 27s emerged from Horwich Works in 1909. The superheated 27s had the same boiler pressure as the originals, 180 psi. The first batch had round topped boilers, but in 1912 a second batch of 20 was constructed with Belpaire fireboxes.
Although the class was augmented by 60 engines between 1900 and 1909 and another ten between 1917–18, the last five built reverted to the original 1889 specification.
It is a tribute to the soundness, usefulness and simple practicality of Aspinall's design that 300 of the class passed into the ownership of the London, Midland and Scottish Railway (LMS) and around 50 were operating in British Railways (BR) service in summer 1960. British Railways took ownership of 235 of the class in 1948 and renumbered them 52088-52529 (with gaps) by the addition of 40000 to their LMS numbers.
- Herring, Peter (2000) Classic British Steam Locomotives, Enderby: Abbeydale, p. 192, ISBN 1-86147-057-6
- Hall, Peter & Fox, Peter (2002) Preserved Locomotives of British Railways, Platform 5: Sheffield, ISBN 1-902336-30-5
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