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Midland Compound 1000

Midland Railway 1000 Class


Type and origin

Power type         Steam

Designer             Samuel Waite Johnson: renewed as superheated Deeley compound by Henry Fowler

Builder                Derby Works

Build date           1902–1909

Total produced   45

Rebuild date       1913–1928



Configuration      4-4-0

UIC classification2′B h3v

Gauge                 4 ft 8 1⁄2 in (1,435 mm)

Leading wheel    diameter3 ft 6 1⁄2 in (1.080 m)

Driver                  diameter7 ft 0 in (2.134 m)

Fuel type             Coal

Boiler                   2631–2635 and 1000–1004: G8½

Remainder:         G9

All rebuilt with      G9AS

Boiler pressure    220 psi (1.52 MPa)

Cylinders             Three, one inside high-pressure,  two outside low-pressure

High-pressure     cylinder size19 in × 26 in (483 mm × 660 mm)

Low-pressure      cylinder size21 in × 26 in (533 mm × 660 mm)

Valve gear          Stephenson

Valve type           HP: piston valve,  LP: slide valves


Performance figures

Tractive effort      21,840 lbf (97.1 kN)



Operator             MR → LMS → BR

Class                  1000

Power                 class 4P

Disposition         One preserved, remainder scrapped.

These were developed from a series of five locomotives (2631–2635), introduced in 1902 by Samuel W. Johnson, which had had a 3-cylinder compound arrangement on the Smith system. This had a layout of one high pressure cylinder inside the frames, and two low pressure cylinders outside, and utilised Smith's starting arrangement. On the first two locomotives, independent control of high-pressure and low-pressure valve gears was available. From 1905 onwards, Johnson's successor Richard Deeley built an enlarged and simplified version, eliminating all the Smith refinements whilst fitting his own starting arrangement, making the engines simpler to drive. These locomotives were originally numbered 1000–1029, but in the 1907 renumbering scheme the five Smith/Johnson locomotives became 1000–1004 and the Deeley compounds 1005–1034, ten more of these being added in 1908–1909. The original Johnson locomotives were all subsequently renewed as Deeley compounds, including the now-preserved 1000 which was rebuilt and outshopped with a superheater in 1914.

Numbered 1000–1044 by both the Midland and LMS companies, British Railways renumbered the Midland series of compounds 41000–41044 after nationalisation in 1948.