L&YR Class 7

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Lancashire & Yorkshire Railway class 7
Type and origin
Power type Steam
Designer John Aspinall
Build date 1899–1902
Total produced 40
Specifications
Configuration 4-4-2
UIC class 2'B1'
Gauge 4 ft 8 12 in (1,435 mm)
Driver dia. 7 ft 3 in (2.210 m)
Loco weight 58.75 long tons (59.69 t)
Boiler pressure 180 psi (1.24 MPa)
Cylinders Two
Cylinder size 19 in × 26 in (483 mm × 660 mm)
Valve gear Joy
Performance figures
Tractive effort 16,506 lbf (73.4 kN)
Career
Operators L&YR, LMS
Class L&YR: 7
Power class LMS: 2P
Numbers LMS: 10300–10339
Withdrawn 1926–1934
Disposition All scrapped

The Lancashire and Yorkshire Railway (L&YR) Class 7 was a class of Atlantic passenger steam locomotives to the design of John Aspinall. Forty were built between 1899 and 1902. They were known as "High-Flyers" as a result of having a high-pitched boiler that was supposed to increase stability at speed. All passed into London, Midland and Scottish Railway (LMS) ownership on the grouping of 1923, becoming the LMS's only atlantic tender engine class. The LMS gave them the power classification 2P. Withdrawals started in 1926, and the last was withdrawn in 1934. None was preserved.

Numbering[edit]

The locomotives were built in two batches of 20 at Horwich Works. The first batch, turned out in 1899, were numbered 1400, 1392–9, 1401–4, 700, 702, 708, 711, 718, 735, 737; the second batch of 1902 were numbered 1405–24. Those numbered in the 700s took the numbers of older locomotives which had been withdrawn; the others were given numbers at the end of the L&YR list which were as yet unused. Under the LMS, they were allocated the numbers 10300–39 in order of construction, but several were withdrawn before these numbers could be applied.[1]

Details[edit]

No. 737, the last locomotive of the first batch, is believed by John Marshall to have been the first British superheated locomotive. The front tubeplate of the boiler was recessed, creating a cylindrical space into which the superheater was mounted. This consisted of a drum 3 ft 6 in (1,067 mm) long through which were a number of tubes for the hot gases to pass through. It offered only a low degree of superheat – 95 °F (35 °C) above the normal steam temperature. The last five locomotives of the 1902 batch, nos. 1420–4, were given the same apparatus when new, but it was removed from all six by 1917.[2]

Notes[edit]

  1. ^ Marshall 1972, p. 259.
  2. ^ Marshall 1972, p. 146.

References[edit]