GNR Class O2

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GNR Class O2
Doncaster station geograph-2463320-by-Ben-Brooksbank.jpg
O2/3 2-8-0 No. 3963 at Doncaster 1947
Type and origin
Power typeSteam
Designer Nigel Gresley
Builder
Build date1918, 1921 – 1943
Total produced67
Specifications
Configuration:
   Whyte 2-8-0
   UIC 1'Dh3
Gauge 4 ft 8+12 in (1,435 mm)
Leading dia. 2 ft 8 in (1 m)
Coupled dia.4 ft 8 in (1 m)
Length63 ft 3 in (19.28 m)
Width8 ft 9 in (2.67 m)
Height12 ft 11.25 in (3.9434 m)
Loco weight74.1–78.65 long tons (75.29–79.91 t)
Tender weight43.1–52 long tons (43.8–52.8 t)
Fuel typeCoal
Firebox:
  Grate area27.5 sq ft (2.55 m2)
Boiler:
  Diameter5 ft 4.75 in (1,644.6 mm) or 5 ft 6 in (1,680 mm)
Boiler pressure180 lbf/in2 (1.24 MPa)
Heating surface2,032 sq ft (188.8 m2)
Superheater:
  Heating area430.5 sq ft (39.99 m2)
Cylinders Three
Cylinder size 18+12 in × 26 in (470 mm × 660 mm)
Valve gear
Valve type8-inch (203 mm) piston valves
Performance figures
Tractive effort 36,740 lbf (163.4 kN)
Career
Operators
Power classBR: 8F
NumbersGNR: 461, LNER: 3921-3987, BR: 63921-63987
Locale Eastern Region
Withdrawn1948, 1960 – 1963
DispositionAll 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.

Contents

Sub-classes

The LNER created four subclasses: [1]

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 ten further O2s was built by the North British Locomotive Co. in 1921.

LNER

Fifteen more O2s were built immediately after the Grouping in 1923. Sixteen more were delivered in 1932 and 1933. Wartime requirements led to the construction of 25 from 1942 to 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, all members of the class had been scrapped.

O2/2 63942 at Doncaster 1961 Doncaster Locomotive Depot geograph-2463296-by-Ben-Brooksbank.jpg
O2/2 63942 at Doncaster 1961
O2/4 No. 63966 with side-window cab, band 100A boiler at Retford Locomotive Depot 1962 Retford (GC) Locomotive Depot geograph-2463346-by-Ben-Brooksbank.jpg
O2/4 No. 63966 with side-window cab, band 100A boiler at Retford Locomotive Depot 1962

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References

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