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GNR/LNER Gresley "O2" Class 2-8-0


General
Designer Gresley
Introduced 1918
Pre-Grouping Great Northern Railway
Big Four London and North Eastern Railway
Description (1957) Class O2, the original Gresley 3-cylinder 2-8-0, built in 1918 and the first 3-cylinder locomotive constructed by him. It differed from the rest of the class by having inclined cylinders. Finally withdrawn in 1948 as No. 3921.

Class O2/1 - O2/4, a development of the original engine (No. 63921). Constructed by Gresley as 3-cylinder 2-8-0's with 4'8" wheels between 1921 and 1934. All the class were still running in 1957,
Wheels 2-8-0
Number Built as O2 67
First in Service 05/1918
Last in Service 03/11/1963
Manufacturers
ManufacturerTotal
Doncaster Works 57
North British Locomotive Company, Glasgow 10
Orders
BuilderOrder #DateSize
North British Locomotive Company, Glasgow -
Doncaster Works 283
Doncaster Works -

Power
O2/1 O2/2 O2/3 O2/4 O2
Variant Introduced 1921
As O2/1
As O2/1
As O2/1
1918
Miscellaneous Differences Great Northern loading gauge, with side window cabs
As O2/1
As O2/1
Diagram 100A superheated boiler (set at 180lb/sq in) Original engine with Gresley patent conjugated valve gear.
Tractive Effort 36,470lbs
As O2/1
As O2/1
As O2/1
34,523lbs
Inside Cylinders 18.5" x 26" (1 off)
As O2/1
As O2/1
As O2/1
As O2/1
Inside Valves 8"Piston
As O2/1
As O2/1
As O2/1
As O2/1
Inside Motion Gresley
As O2/1
As O2/1
As O2/1
As O2/1
Outside Cylinders 18.5" x 26" (2 off)
As O2/1
As O2/1
As O2/1
As O2/1
Outside Valves 8"Piston
As O2/1
As O2/1
As O2/1
As O2/1
Outside Motion Gresley
As O2/1
As O2/1
As O2/1
As O2/1

Wheels
O2/1 O2/2 O2/3 O2/4 O2
Pony 2' 8"
As O2/1
As O2/1
As O2/1
3' 2"
Drivers 4' 8"
As O2/1
As O2/1
As O2/1
As O2/1
Locomotive Wheelbase 27' 2"
As O2/1
As O2/1
As O2/1
26' 4"
Tender Wheelbase 13'
As O2/1
As O2/1
As O2/1
As O2/1
Descriptive Wheelbase 8' 8" + 6' 6" + 6' 0" + 6' 0" = 27' 2" (engine only)
As O2/1
As O2/1
As O2/1
7' 10" + 6' 6" + 6' 0" + 6' 0" = 26' 4" (engine only)

Dimensions
O2/1 O2/2 O2/3 O2/4 O2
Length (over buffers) 61' 434"
As O2/1
As O2/1
As O2/1
As O2/1
Weight (in running order) 118t 18cwt
As O2/1
As O2/1
As O2/1
As O2/1
Weight (loco only) 75t 16cwt
As O2/1
78t 13cwt 74t 2cwt 76t 8cwt
Adhesive Weight 67t 7cwt
As O2/1
69t 7cwt 64t 12cwt 66t 12cwt
Maximum Axle Load 17t 12cwt
As O2/1
18t 9cwt 17t 3cwt 17t 2cwt
Water Capacity 3,500gal
As O2/1
As O2/1
As O2/1
As O2/1
Coal Capacity 6t 10cwt
As O2/1
As O2/1
As O2/1
As O2/1

Boiler & Firebox
O2/1 O2/2 O2/3 O2/4 O2
Boiler Diagram 2
As O2/1
As O2/1
100A
As O2/1
Boiler Max Diameter 5' 6"
As O2/1
As O2/1
5' 6"
As O2/1
Boiler Barrel Length 16' 138"
As O2/1
As O2/1
13' 1178"
As O2/1
Boiler Pressure 180lbs
As O2/1
As O2/1
225lbs
As O2/1
Boiler Pitch 8' 714"
As O2/1
As O2/1
As O2/1
As O2/1
Firebox Length 9' 6"
As O2/1
As O2/1
9'
As O2/1
Firebox Grate Area 27.5ft2
As O2/1
As O2/1
27.9ft2
As O2/1
Firebox Heating Surface 163.5ft2
As O2/1
As O2/1
168ft2
As O2/1
Tube Number 160
As O2/1
As O2/1
141
As O2/1
Tube Diameter 2"
As O2/1
As O2/1
2"
As O2/1
Tube Area 1340.5ft2
As O2/1
As O2/1
1033ft2
As O2/1
Flue Elements 24
As O2/1
As O2/1
24
As O2/1
Flue Diameter 514"
As O2/1
As O2/1
514"
As O2/1
Flue Area 528ft2
As O2/1
As O2/1
460ft2
As O2/1
Total Evaporative Area 2032ft2
As O2/1
As O2/1
1661ft2
As O2/1
Superheater Elements 24
As O2/1
As O2/1
24
As O2/1
Superheater Element Diameter 114"
As O2/1
As O2/1
1.244"
As O2/1
Superheater Element Area 430.5ft2
As O2/1
As O2/1
344ft2
As O2/1
Total Heating Area 2462.5ft2
As O2/1
As O2/1
As O2/1
As O2/1