GCR Class 8H
|Great Central Railway class 8H|
|Designer||John G. Robinson|
|Build date||1908 (4), 1932 (2)|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|Driver diameter||4 ft 8 in (1.422 m)|
|3 ft 2 in (0.965 m)|
|Boiler pressure||180 psi (1.24 MPa)|
|Cylinder size||18 in × 26 in (457 mm × 660 mm)|
|Valve type||Slide valves|
|Tractive effort||34,525 lbf (153.6 kN)|
|Railroad(s)||Great Central Railway;
London and North Eastern Railway;
LNER 6170–6173; later 9900–9905;
Four locomotives were built in 1907/1908 for the Great Central Railway. They were fitted with 3 cylinders. This gave a more even torque than with a 2-cylinder locomotive and reduced the risk of wheelslip under heavy load. All four passed into London and North Eastern Railway ownership at the 1923 grouping.
These were powerful locomotives but even more power was required so, in 1930, one locomotive was fitted with a superheater and a booster engine and classified S1/2. Two new locomotives (with superheaters and boosters) were built by the LNER in 1932 and classified S1/3. The remaining (non-booster) locomotives were classified S1/1 and were also fitted with superheaters. All the boosters were removed in 1943.
All 6 locomotives passed into British Railways ownership in 1948 and were numbered 69900-69905.
- BR Power classification, Not known
- Locomotive weight:
- S1/1, 99 tons 6 cwt
- S1/2, 99 tons 2 cwt
- S1/3, 99 tons 1 cwt
- Boiler pressure, 180 psi
- S1/1, No, but fitted later
- S1/2, Yes
- S1/3, Yes
- Cylinders, (3) 18"x26"
- Driving wheel diameter, 4' 8"
- Tractive effort, 34,525 lbf
- Booster tractive effort, Not known
- Valve gear, Stephenson (slide valves)
For terminology, see Steam locomotive components
- Ian Allan ABC of British Railways Locomotives, 1948 edition, part 4, page 56
- Casserley, H.C.; S. W. Johnston (1966, 1974). Locomotives at the Grouping 2: London & North Eastern Railway. Shepperton, Surrey: Ian Allan Limited. ISBN 0-7110-0553-2.
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GCR class 8H/ LNER class S1.