GNR Class O2

O2/3 2-8-0 No. 3963 at Doncaster 1947

Type and origin
Power type	Steam
Designer	Nigel Gresley
Builder	Doncaster Works (57) North British Locomotive Co. (10)
Build date	1918–1943
Total produced	67

Specifications
Configuration	2-8-0
UIC class	1′D h3
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm)
Leading dia.	2 ft 8 in (1 m)
Coupled dia.	4 ft 8 in (1 m)
Length	63 ft 3 in (19.28 m)
Loco weight	74.1–78.65 long tons (75.29–79.91 t)
Tender weight	43.1–52 long tons (43.8–52.8 t)
Fuel type	Coal
Boiler pressure	180 lbf/in² (1.24 MPa)
Cylinders	Three
Cylinder size	18 ¹⁄₂ in × 26 in (470 mm × 660 mm)
Valve gear	Gresley conjugated
Valve type	8-inch (203 mm) piston valves

Performance figures
Tractive effort	36,740 lbf (163.4 kN)

Career
Operators	Great Northern Railway London and North Eastern Railway Eastern Region of British Railways
Power class	BR: 8F
Withdrawn	1948–1963
Disposition	All scrapped

The Great Northern Railway (GNR) Class O2 was a class of three-cylinder 2-8-0 steam locomotives designed by Nigel Gresley for freight work and built by the GNR from 1921. Further examples were built by the London and North Eastern Railway (LNER) from 1924.

Sub-classes

The LNER created four subclasses: ^[1]

O2/1, Introduced 1921. Development of experimental Gresley GNR 3-cylinder locomotive (LNER 3921). Subsequently rebuilt with side-window cab and reduced boiler mountings.
O2/2, Introduced 1924. Development of O2/1 with detail differences.
O2/3, Introduced 1932. Development of O2/2 with side-window cab and reduced boiler mountings.
O2/4, Introduced 1943. Rebuilt with 100A (B1 type) boiler and smokebox extended backwards.

GNR

The first models of this class were designed and built under GNR ownership, the first locomotive, 461, was built in May 1918. A batch of 10 further O2s was built by the North British Locomotive Co. in 1921.

LNER

Immediately after Grouping (1923), fifteen more O2s were built.

16 more were delivered in 1932/33. Wartime requirements led to the construction of 25 in 1942/43 in three batches.

British Railways

All 67 locomotives passed to British Railways (BR) in 1948 and were given BR Numbers 63921-63987, but 63921 (which was the prototype 461, LNER 3921) was quickly scrapped. They served all across the former LNER from Stratford through East Anglia into the East Midlands, primarily hauling coal and iron ore trains. By winter 1955/56, they had all gravitated to Doncaster (36A - 35 locomotives), Grantham (35B - 14 locomotives) and Retford (36E - 17 locomotives). By winter 1962, they were down to 52 locomotives still in much the same locations, the following having been scrapped: 63929/34/44/47/50-55/57-59/70.

By the end of 1963 they were all gone, and none was preserved.

Gallery

O2/2 63942 at Doncaster 1961

O2/4 No. 63966 with side-window cab, band 100A boiler at Retford Locomotive Depot 1962

References

↑ Ian Allan ABC of British Railways Locomotives, summer 1961 edition, part 4, pp 37–38

British Railways Locomotives Combined Volume Winter 1955/56, part 4, p. 32, and the locoshed section, p. 71.
British Railways Locomotives Combined Volume 11/62, p. 144
Boddy, M. G.; Brown, W. A.; Neve, E.; Yeadon, W. B. (November 1983). Fry, E. V., ed. Locomotives of the L.N.E.R., Part 6B: Tender Engines—Classes O1 to P2. Kenilworth: RCTS. ISBN 0-901115-54-1.

External links

Wikimedia Commons has media related to GNR Class O2 / LNER Class O2.

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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