The Great Northern Railway (GNR) Class O1 was a class of two-cylinder 2-8-0 steam locomotive designed by Nigel Gresley for heavy freight work and built by the GNR between 1913 and 1919.

GNR O1 class
LNER O1 (later O3) Class
No. 3491 at Immingham Locomotive Depot 1947
Type and origin
Power typeSteam
DesignerNigel Gresley
Builder
Build date1913–1919
Total produced20
Specifications
Configuration:
 • Whyte2-8-0
 • UIC1′D h2
Gauge4 ft 8+12 in (1,435 mm)
Leading dia.3 ft 2 in (965 mm)
Coupled dia.4 ft 8 in (1,422 mm)
Length60 ft 11.5 in (18.580 m)
Loco weight76.2–78.65 long tons (77.42–79.91 t)
Fuel typeCoal
Firebox:
 • Grate area27 sq ft (2.5 m2)
Boiler:
 • Diameter5 ft 6 in (1,680 mm)
Boiler pressure180 lbf/in2 (1.24 MPa)
Heating surface:
 • Firebox162 sq ft (15.1 m2)
 • Total surface2,084 sq ft (193.6 m2)
Superheater:
 • Type24
 • Heating area570 sq ft (53 m2)
CylindersTwo, outside
Cylinder size21 in × 28 in (533 mm × 711 mm)
Valve gearWalschaerts
Valve type10-inch (254 mm) piston valves
Performance figures
Tractive effort33,735 lbf (150.06 kN)
Career
Operators
Power class8F
NicknamesTangos
Axle load classRoute availability 6
Withdrawn1947–1952
DispositionAll scrapped

History

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Gresley designed the O1 2-8-0 for the heavy coal trains on the mainline from Grantham to London, ordering five examples 1913, which were completed at Doncaster in 1914. A further fifteen were ordered in January 1916, but due to the First World War delays were incurred and construction was transferred to the North British Locomotive Company, who delivered the first ten in April 1918, followed by a further five in October and November 1919.

Table of orders and numbers
Year Order Manufacturer Serial number Quantity GNR Nos. LNER Nos. LNER 1944 Nos. Notes
1913–14 EO 274 Doncaster Works 1411–1413, 1415, 1418 5 456–460 3456–3460 3475–3479
1919 North British Locomotive Co.
(Hyde Park Works)
22060–22069 10 462–471 3462–3471 3480–3489
1919 North British Locomotive Co.
(Atlas Works)
22099–22103 5 472–476 3472–3476 3490–3494

The class was re-designated O3 by the London and North Eastern Railway in 1944.

British Railways

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Seventeen examples survived into British Railways ownership in 1948, but all had been withdrawn by 1952.

Table of withdrawals
Year Quantity in
service at
start of year
Quantity
withdrawn
Locomotive numbers Notes
1947 20 3 3487, 3490, 3492
1948 17 2 3489/94
1949 15 0
1950 15 1 63491
1951 14 10 63475/77–81/83/85–86/93
1952 4 4 63476/82/84/88

References

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  • 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.
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