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GCR/LNER Robinson "B7" Class 4-6-0


Class Types
GCR Class 9Q
LNER Class B7

General
Designer Robinson
Introduced 1921
Pre-Grouping Great Central Railway
Big Four London and North Eastern Railway
Description (1957) Class B7, Robinson 4-cylinder mixed traffics with 5'7" wheels, built 1921-24. All of the class were scrapped between 1948 and 1950. Two carried a 61300 number, and in 1949 the last survivors, Nos. 1365/7, 1375/7, 1381/2/6/7/8, 1391/2/6 were allocated new numbers 61702-61713 to make way for the new B1 class 4-6-0's, then under construction, and some of them actually carried these numbers for a short time before being scrapped.
Wheels 4-6-0
Number Built as B7 38
Number Scrapped 38
First in Service 05/1921
Last in Service 03/07/1950
Manufacturers
ManufacturerTotal
Beyer Peacock Ltd. 5
Gorton Works 23
Vulcan Foundry 10
Orders
BuilderOrder #DateSize
Gorton Works n/a 1921 3
Vulcan Foundry n/a 1921 10
Gorton Works n/a 1921 10
Beyer Peacock Ltd. 02105 1922 5
Gorton Works n/a 1923 10

Illustration
Copyright: Phil Seaford
Power
B7/1 B7/2
Variant Introduced 1921 1923
Miscellaneous Differences   Built to the LNER loading gauge.
Tractive Effort 29,952lbs
As B7/1
Inside Cylinders 16" x 26" (2 off)
As B7/1
Inside Valves 8"Piston
As B7/1
Inside Motion Stephenson
As B7/1
Outside Cylinders 16" x 26" (2 off)
As B7/1
Outside Valves 8"Piston
As B7/1
Outside Motion Stephenson
As B7/1

Wheels
B7/1 B7/2
Pony 3' 6"
As B7/1
Drivers 5' 8"
As B7/1
Locomotive Wheelbase 28' 3"
As B7/1
Tender Wheelbase 13'
As B7/1
Total Wheelbase 52' 912"
As B7/1
Descriptive Wheelbase 6' 6" + 7' 4" + 6' 9" + 7' 8" + (11' 6½") + 6' 6" + 6' 6" = 52' 9½"
As B7/1

Dimensions
B7/1 B7/2
Length (over buffers) 63' 038"
As B7/1
Weight (in running order) 127t 16cwt
As B7/1
Weight (loco only) 79t 10cwt
As B7/1
Adhesive Weight 58t 10cwt
As B7/1
Maximum Axle Load 19t 10cwt
As B7/1
Water Capacity 4,000gal
As B7/1
Coal Capacity 6t 0cwt
As B7/1

Boiler & Firebox
B7/1 B7/2
Boiler Diagram 13
As B7/1
Boiler Max Diameter 5' 6"
As B7/1
Boiler Barrel Length 17' 3"
As B7/1
Boiler Pressure 180lbs
As B7/1
Boiler Pitch 8' 11"
As B7/1
Firebox Length 8' 6"
As B7/1
Firebox Grate Area 26ft2
As B7/1
Firebox Heating Surface 163ft2
As B7/1
Tube Number 139
As B7/1
Tube Diameter 214"
As B7/1
Tube Area 1442ft2
As B7/1
Flue Elements 24
As B7/1
Flue Diameter 514"
As B7/1
Flue Area 578ft2
As B7/1
Total Evaporative Area 2183ft2
As B7/1
Superheater Elements 24
As B7/1
Superheater Element Diameter 1116"
As B7/1
Superheater Element Area 294ft2
As B7/1