Midland Railway 990 Class

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

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: ​  • Whyte 4-4-0  • UIC 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Midland Railway London, Midland and Scottish Railway Class MR: 990 Power class 4P Numbers 990–999 (801–809 from 1926) Withdrawn 1925–1929 Disposition All scrapped

Accidents and incidents

Main article: 1913 Ais Gill rail accident

• On 2 September 1913, locomotive No. 993 was hauling a stalled express passenger train that was involved in a collision with another express at Ais Gill, Westmorland due to the latter passing signals at danger. The other train was hauled by Midland Railway Class 2 4-4-0 No. 446. 16 people were killed and 38 were injured.^[1]

Withdrawal

They passed to the London, Midland and Scottish Railway (LMS) in 1923 and were withdrawn between 1925 and 1929. In 1926, the eight surviving locomotives were renumbered 801 to 809 to free up their old numbers for more compounds. None were preserved, though the first of the compounds was.

Table of withdrawals^[2]

Year	Quantity in service at start of year	Quantity withdrawn	Locomotive numbers
1925	10	1	990
1926	9	1	994
1927	8	2	807
1928	6	4	802, 803, 805, 806
1929	2	2	808, 809

See also

• Locomotives of the Midland Railway