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Record: 71951 (21/04/2026)
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GNR/LNER Gresley "K1" Class 2-6-0


Class Types
GNR Class H2
LNER Class K1

General
Designer Sir Nigel Gresley
Introduced 1912
Pre-Grouping Company Great Northern Railway
Grouping Company London and North Eastern Railway
Wheel Arrangement 2-6-0
Number Built as K1 10
First in Service 08/1912
Last in Service 06/12/1960
Manufacturers
ManufacturerTotal
Doncaster Works 10
Orders
BuilderSponsorOrder #DateSize
Doncaster Works  270 1912 1
Doncaster Works  272 1913 9

Power
Variant Introduced 1912
Tractive Effort 23,400lbs
Outside Cylinders 20" x 26" (2 off)
Outside Valves 10"Piston
Outside Motion Walschaerts

Wheels
Pony 3' 2"
Drivers 5' 8"
Locomotive Wheelbase 24' 10"
Tender Wheelbase 13'
Total Wheelbase 46' 101⁄4"
Descriptive Wheelbase 8' 7" + 7' 3" + 9' 0" + 9' 0¼" + 7' 0" + 6' 0"

Dimensions
Length (over buffers) 56' 6"
Weight (in running order) 104t 16cwt
Weight (loco only) 61t 14cwt
Adhesive Weight 51t 14cwt
Maximum Axle Load 18t 0cwt
Water Capacity 3,500gal
Coal Capacity 6t 10cwt

Boiler & Firebox
Boiler Diagram 6
Boiler Max Diameter 4' 8"
Boiler Barrel Length 11' 8"
Boiler Pressure 180lbs
Boiler Pitch 8' 7"
Firebox Length 8'
Firebox Grate Area 24.5ft2
Firebox Heating Surface 136ft2
Tube Number 118
Tube Diameter 13⁄4"
Tube Area 647ft2
Flue Elements 18
Flue Diameter 51⁄4"
Flue Area 296ft2
Total Evaporative Area 1079ft2
Superheater Elements 18
Superheater Element Diameter 11⁄4"
Superheater Element Area 230ft2
Total Heating Area 1309ft2