Midland Railway 990 Class

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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.

Power typeSteam
Power typeSteam
Quick facts Type and origin, Power type ...
Midland Railway 990 class
The official photograph of 990 in photographic grey livery
Type and origin
Power typeSteam
DesignerRichard Deeley
BuilderDerby Works
Build date1907–1909
Total produced10
Specifications
Configuration:
  Whyte4-4-0
  UIC2′B n2, later 2′B h2
Gauge4 ft 8+12 in (1,435 mm) standard gauge
Leading dia.3 ft 3+12 in (1.003 m)
Driver dia.6 ft 6+12 in (1.994 m)
Loco weight58 long tons 5 cwt (130,500 lb or 59.2 t)
Fuel typeCoal
BoilerMR type G9A, later G9AS
Boiler pressure200 lbf/in2 (1.38 MPa)
CylindersTwo, inside
Cylinder size20+12 in × 26 in (521 mm × 660 mm)
Valve gearDeeley
Performance figures
Tractive effort23,662 lbf (105.3 kN)
Career
Operators
ClassMR: 990
Power class4P
Numbers990–999 (801–809 from 1926)
Withdrawn1925–1929
DispositionAll scrapped
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Accidents and incidents

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They passed to the London, Midland and Scottish Railway (LMS) in 1923 and were withdrawn between 1925 and 1929.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.

More information Year, Quantity inservice at start of year ...
Table of withdrawals[2]
YearQuantity in
service at
start of year
Quantity
withdrawn
Locomotive numbers
1925101990
192691994
192782807
192864802, 803, 805, 806
192922808, 809
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See also

References

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