J50/3 No. 68973 0-6-0T at Doncaster Locomotive Depot, fresh from repair at Doncaster Works
Type and origin
Power type
Steam
Designer
Nigel Gresley
Builder
Doncaster Works
Gorton Works
Build date
1913–1939
Total produced
102
Specifications
Configuration:
• Whyte
0-6-0T
• UIC
C
Gauge
4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.
56 in (1.422 m)
Loco weight
J50/1: 56.3 long tons (57.2 t; 63.1 short tons) J50/2: 57 long tons (58 t; 64 short tons) J50/3 & J50/4: 58.15 long tons (59.08 t; 65.13 short tons)
Fuel type
Coal
Boiler pressure
175 psi (1.21 MPa)
Cylinders
Two, inside
Cylinder size
18+1⁄2 in × 26 in (470 mm × 660 mm)
Performance figures
Tractive effort
23,636 lbf (105.14 kN)
Career
Operators
London and North Eastern Railway British Railways
Class
GNR: J23; LNER: J50, J51
Power class
BR: 4F
Number in class
J50/1: 10 J50/2: 40 J50/3: 38 J50/4: 14
Nicknames
Submarines
Axle load class
Route Availability 6
Locale
Eastern Region
Withdrawn
1958–1965
Disposition
All scrapped.
The Great Northern Railway Class J23 was a class of 0-6-0T steam locomotive. They had long side tanks that came to the front of the smokebox, which sloped forwards to improve visibility and had a recess cut in to aid maintenance. Forty were built by the Great Northern Railway (GNR) between 1913 and 1922, with a further 62 being added by the London and North Eastern Railway (LNER) between 1924 and 1939. They were given the nickname "Submarines" due to their long tanks.[1]
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