Midland Railway 990 Class

Midland Railway 990 class

The official photograph of 990 in photographic grey livery

Type and origin Power type Steam Designer Richard Deeley Builder Derby Works Build date 1907–1909 Total produced 10

Specifications Configuration 4-4-0 UIC class 2′B n2, later 2′B h2 Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Leading dia. 3 ft 3 1⁄2 in (1.003 m) Driver dia. 6 ft 6 1⁄2 in (1.994 m) Loco weight 58 long tons 5 cwt (130,500 lb or 59.2 t) Fuel type Coal Boiler MR type G9A, later G9AS Boiler pressure 200 lbf/in2 (1.38 MPa) Cylinders Two, inside Cylinder size 20 1⁄2 in × 26 in (521 mm × 660 mm) Valve gear Deeley

Performance figures Tractive effort 23,662 lbf (105.3 kN)

Career Operators Midland Railway London, Midland and Scottish Railway Class MR: 990 Power class 4P Numbers 990–999 (801–809 from 1926) Withdrawn 1925–1928 Disposition All scrapped

The Midland Railway 990 class was a class of 4-4-0 steam locomotive. Ten were built by the Midland Railway in 1907–1909, with simple expansion, to compare with the 1000 class compounds, with which they shared many features. Initially built as saturated, from 1910 to 1914, they were equipped with superheated boilers. These locomotives were well known for their work North of Leeds, over the demanding Settle and Carlisle route.

They passed to the London, Midland and Scottish Railway (LMS) in 1923 and were withdrawn between 1925 and 1928. in 1926, the eight surviving locomotives were renumbered 801 to 809 to free-up their old numbers for more Compounds. None has survived to preservation, though the first of the compounds has.