GCR Class 8H

Great Central Railway class 8H

69901 at Dunford Bridge on the Woodhead Line in 1950

Type and origin
Power type	Steam
Designer	John G. Robinson
Build date	1908 (4), 1932 (2)
Total produced	6

Specifications
Configuration	0-8-4T
UIC class	D2′ n3t, later D2′ h3t
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm)
Driver dia.	4 ft 8 in (1.422 m)
Trailing dia.	3 ft 2 in (0.965 m)
Fuel type	Coal
Boiler pressure	180 psi (1.24 MPa)
Cylinders	Three
Cylinder size	18 in × 26 in (457 mm × 660 mm)
Valve gear	Stephenson
Valve type	Slide valves

Performance figures
Tractive effort	34,525 lbf (153.6 kN)

Career
Operators	Great Central Railway → London and North Eastern Railway → British Railways
Class	GCR: 8H LNER: S1
Numbers	GCR: 1170–1173 LNER: 6170–6173; later 9900–9905 BR: 69900–69905
Withdrawn	1955–1957
Disposition	All scrapped

The Great Central Railway Class 8H (LNER Class S1) was a class of 0-8-4T steam tank locomotives designed by John G. Robinson for hump shunting at Wath marshalling yard.

Overview

Four locomotives were built in 1907/1908 for the Great Central Railway. They were fitted with three 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. At the time all four locomotives were allocated to Mexborough engine shed.^[1]

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 six locomotives passed into British Railways ownership in 1948 and were numbered 69900-69905.

Dimensions

Locomotive weight:
- S1/1, 99 tons 6 cwt
- S1/2, 99 tons 2 cwt
- S1/3, 99 tons 1 cwt
Superheater:
- S1/1, No, but fitted later
- S1/2, Yes
- S1/3, Yes
Tractive effort, 34,525 lbf
- Booster tractive effort, Not known
BR Power classification, Not known

For terminology, see Steam locomotive components

References

↑ Yeadon, W B (1996). LNER Locomotive allocations 1 January 1923. Oldham: Challenger Publications. p. 10. ISBN 1-899624-19-8.

Ian Allan ABC of British Railways Locomotives, part 4 (1948 ed.). p. 56.
Casserley, H.C.; S. W. Johnston (1974) [1966]. Locomotives at the Grouping 2: London & North Eastern Railway. Shepperton, Surrey: Ian Allan Limited. ISBN 0-7110-0553-2.

External links

Wikimedia Commons has media related to
GCR class 8H/ LNER class S1.

LNER Encyclopedia

London and North Eastern Railway locomotives

Pre-grouping railway designs:

Great Central:	A5 B1/B18 B2/B19 B3 B4 B5 B6 B7 B8 B9 C4 C5 C13 C14 D5 D6 D7 D8 D9 D10 D11 D12 E2 E3 E8 F1 F2 G3 J8 J9 J10 J11 J12 J13 J58 J59 J60 J61 J62 J63 L1/L3 M1 N4 N5 N6 O4 O5 Q4 S1 X4 Y2

Great Eastern:	B12 D13 D14 D15 D16 E4 F3 F4 F5 F6 F7 G4 J14 J15 J16 J17 J18 J19 J20 J65 J66 J67 J68 J69 J70 N7 Y4 Y5 Y6 Z4/J92

Great North of Scotland:	D38 D39 D40 D41 D42 D43 D44 D45 D46 D47 D48 G10 J90 J91 Z4 Z5

Great Northern:	A1 C1 C2 C12 D1 D2 D3 D4 E1 G1 G2 J1 J2 J3 J4 J5 J6 J7 J50 J51 J52 J53 J54 J55 J56 J57 K1 K2 K3 N1 N2 O1 O2 Q1 Q2 Q3 R1

North British:	C10 C11 C15 C16 D25 D26 D27 D28 D29 D30 D31 D32 D33 D34 D35 D36 D50 D51 E7 G7 G8 G9 J31 J32 J33 J34 J35 J36 J37 J81 J82 J83 J84 J85 J86 J88 N14 N15 Y9 Y10

North Eastern:	A2 A6 A7 B13 B14 B15 B16 C6 C7 C8 D17/1 D17/2 D18 D19 D20 D21 D22 D23 E5 E6 F8 G5 G6 H1 J21 J22 J24 J25 J26 J27 J71 J72 J73 J74 J76 J77 J78 J79 N8 N9 N10 Q5 Q6 Q7 T1 X1 X2 X3 Y7 Y8 EB1 EE1 EF1 ES1

North Eastern (ex Hull & Barnsley)	D24 J23 J28 J75 J80 N11 N12 N13 Q10

LNER designs:

Gresley (1923–1941):	A1 A3 A4 A8 B17 D49 J38 J39 J50 K4 P1 P2 U1 V1 V2 V3 V4 W1 EM1

Thompson (1941–1946):	A1 A2/1 A2/2 A2/3 B1 B2 K1 K5 L1 O1 Q1

Peppercorn (1946–1947):	A1 A2 K1

Other designs:

Proposed designs:

P10 2-8-2T (Nov 1929)
B 4-6-0 (Nov 1936)
? 4-8-2 (1939)
Q 0-8-0 (June 1930)
D 4-4-0 (1943)
? 4-8-4 (Feb 1946)
? 4-8-2 (Feb 1946)
K 2-6-0 (Aug 1947)

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