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Record: 71951 (21/04/2026)
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GCR/LNER Robinson "B3" Class 4-6-0


Class Types
GCR Class 9P
LNER Class B3

General
Designer John Robinson
Introduced 1917
Pre-Grouping Company Great Central Railway
Grouping Company London and North Eastern Railway
Description (1957) Class B3/3. The survivor of Robinson's 6'9" 4-cylinder 'Lord Farringdon' class, built 1917-20. All were withdrawn 1946-47, except No. 1497, which had been completely rebuilt in 1942 as a 2-cylinder engine. Scrapped in 1949.
Wheel Arrangement 4-6-0
Number Built as B3 6
Number Scrapped 6
First in Service 11/1917
Last in Service 14/04/1949
Manufacturers
ManufacturerTotal
Gorton Works 6
Orders
BuilderSponsorOrder #DateSize
Gorton Works  n/a 6
Classification Southern Area 4
Route Availability 7 (B3/1 & B3/2), 5 (B3/3)
BR Power Class 4P (B3/3)
Engine Diagrams
DiagramDetails
Section C, 1924 Dimensions given for 24 and 28 element superheaters. Became B3/1 in December 1929.
Section C, 12/1929 Engines with Caprotti valve gear. Classified B3/2
Section C, 1938 B3/1. Revised diagram.
Section C, 1938 B3/2. Revised diagram.
1943. Thompson rebuild of 6166. Classified B3/3.
1947. B3/3 amended boiler heating surface.

Illustration
Copyright: Alan Whitehead c/o 53A Models
Power
B3/1 B3/2 B3/3
Variant Introduced 1917 1929 1943
Tractive Effort 25,145lbs
As B3/1
 24,555lbs
Inside Cylinders 16" x 26" (2 off)
As B3/1
As B3/1
Inside Valves 8"Piston
As B3/1
As B3/1
Inside Motion Stephenson
As B3/1
As B3/1
Outside Cylinders 16" x 26" (2 off)
As B3/1
 20" x 26" (2 off)
Outside Valves 8"Piston
As B3/1
 10"Piston
Outside Motion Stephenson Caprotti Walschaerts

Wheels
B3/1 B3/2 B3/3
Pony 3' 6"
As B3/1
As B3/1
Drivers 6' 9"
As B3/1
As B3/1
Locomotive Wheelbase 28' 10"
As B3/1
 27' 11"
Tender Wheelbase 13'
As B3/1
As B3/1
Total Wheelbase 52' 91⁄2"
As B3/1
 51' 105⁄8"
Descriptive Wheelbase 6' 6" + 6' 10" + 7' 3" + 8' 3" + (10' 11½") + 6' 6" + 6' 6" = 52' 9½"
As B3/1
 6' 6" + 5' 11" + 7' 3" + 8' 3" + (10' 11⅝") + 6' 6" + 6' 6" = 51' 10⅝"

Dimensions
B3/1 B3/2 B3/3
Length (over buffers) 63' 03⁄8"
As B3/1
 62' 17⁄8"
Weight (in running order) 127t 8cwt
As B3/1
 119t 13cwt
Weight (loco only) 79t 2cwt
As B3/1
 71t 7cwt
Adhesive Weight 57t 2cwt
As B3/1
 48t 6cwt
Maximum Axle Load 20t 0cwt
As B3/1
 18t 3cwt
Water Capacity 4,000gal
As B3/1
As B3/1
Coal Capacity 6t 0cwt
As B3/1
As B3/1

Boiler & Firebox
B3/1 B3/2 B3/3
Boiler Diagram 13
As B3/1
 100A
Boiler Max Diameter 5' 6"
As B3/1
 5' 6"
Boiler Barrel Length 17' 3"
As B3/1
 13' 117⁄8"
Boiler Pressure 180lbs
As B3/1
 225lbs
Boiler Pitch 8' 11"
As B3/1
As B3/1
Firebox Length 8' 6"
As B3/1
 9'
Firebox Grate Area 26ft2
As B3/1
 27.9ft2
Firebox Heating Surface 163ft2
As B3/1
 168ft2
Tube Number 139
As B3/1
 141
Tube Diameter 21⁄4"
As B3/1
 2"
Tube Area 1442ft2
As B3/1
 1033ft2
Flue Elements 24
As B3/1
 24
Flue Diameter 51⁄4"
As B3/1
 51⁄4"
Flue Area 578ft2
As B3/1
 460ft2
Total Evaporative Area 2183ft2
As B3/1
 1661ft2
Superheater Elements 24
As B3/1
 24
Superheater Element Diameter 11⁄16"
As B3/1
 1.244"
Superheater Element Area 294ft2
As B3/1
 344ft2