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GNR/LNER Ivatt "C1" Class 4-4-2


Class Types
GNR Class C1

General
Designer Ivatt
Introduced 1902
Pre-Grouping Great Northern Railway
Big Four London and North Eastern Railway
Description (1957) Class C1. Ivatt's large Great Northern Atlantics with 2 outside cylinders and 6'8" wheels. A class of originally 93 engines built between 1902-10. Of the 17 survivors to come into British Railways' stock, all were taken out of service by 1950, but the original engine, G.N.R. No. 251, has been preserved.
Wheels 4-4-2
Number Built as C1 94
First in Service 06/1904
Last in Service 27/11/1950
Manufacturers
ManufacturerTotal
Doncaster Works 93
Vulcan Foundry 1
Orders
BuilderOrder #DateSize
Doncaster Works 232 1902 1
Doncaster Works 236 1904 20
Doncaster Works 239 1905 1
Vulcan Foundry n/a 1905 1
Doncaster Works 240 1905 10
Doncaster Works 241 1905 10
Doncaster Works 245 1906 10
Doncaster Works 248 1907 1
Doncaster Works 249 1907 10
Doncaster Works 253 1907 10
Doncaster Works 255 1908 10
Doncaster Works 263 1910 10

Power
Standard Piston Valves No. 3292 No. 1421 No. 1300 No. 3279 C1 Booster
Variant Introduced 1902 1910 1905 1907 1907 1915 1923
Miscellaneous Differences Slide Valves, 2 x cylinders, 19 x 24" Piston Valves, 2 x cylinders, 20" x 24" Ivatt's Compound, Walshaerts & Stephenson valve gear
As Standard
Vulcan Compound Gresley 4 Cylinder simple rebuild, Walschaerts valve gear Booster mechanism
Tractive Effort 15,649lbs 17,340lbs 21,326lbs
As Standard
As Standard
21,128lbs
As Standard
Inside Cylinders     16" x 26" (2 off)     15" x 26" (2 off)  
Inside Valves     Slide     8"Piston  
Inside Motion     Stephenson     Walschaerts  
Outside Cylinders 19" x 24" (2 off) 20" x 24" (2 off) 13" x 20" (2 off)
As Standard
As Standard
15" x 26" (2 off)
As Standard
Outside Valves Slide 8"Piston Slide
As Standard
As Standard
8"Piston
As Standard
Outside Motion Stephenson Stephenson Walschaerts
As Standard
As Standard
Walschaerts
As Standard

Wheels
Standard Piston Valves No. 3292 No. 1421 No. 1300 No. 3279 C1 Booster
Pony 3' 8"
As Standard
As Standard
As Standard
3' 2" 3' 2"
As Standard
Drivers 6' 8"
As Standard
As Standard
As Standard
As Standard
As Standard
As Standard
Truck 3' 8"
As Standard
As Standard
As Standard
As Standard
As Standard
As Standard
Locomotive Wheelbase 26' 4" 26' 414"
As Standard
As Standard
As Standard
As Standard
As Standard
Tender Wheelbase 13'
As Standard
As Standard
As Standard
As Standard
As Standard
As Standard
Total Wheelbase 48' 512" 48' 534"
As Standard
As Standard
As Standard
48' 334" 50' 634"
Descriptive Wheelbase 6' 3" + 5' 3" + 6' 10" + 8' 0" + (9' 1½") + 7' 0" + 6' 0" = 48' 5½" 6' 3" + 5' 3¼" + 6' 10" + 8' 0" + (9' 1½") + 7' 0" + 6' 0" = 48' 5¾"
As Standard
As Standard
As Standard
6' 3" + 5' 3" + 6' 10" + 8' 0" + (1' 11¾") + 7' 0" + 6' 0" = 48' 3¾"
As Standard

Dimensions
Standard Piston Valves No. 3292 No. 1421 No. 1300 No. 3279 C1 Booster
Length (over buffers) 57' 1014"
As Standard
As Standard
As Standard
59' 112" 57' 814" 59' 1112"
Weight (in running order) 112t 14cwt
As Standard
109t 18cwt
As Standard
113t 7cwt 116t 12cwt
As Standard
Weight (loco only) 69t 12cwt
As Standard
69t 0cwt
As Standard
70t 5cwt 73t 10cwt 74t 2cwt
Adhesive Weight 40t 0cwt
As Standard
40t 18cwt
As Standard
As Standard
As Standard
As Standard
Maximum Axle Load 20t 0cwt
As Standard
20t 0cwt
As Standard
As Standard
As Standard
As Standard
Water Capacity 3,500gal
As Standard
3,670gal
As Standard
As Standard
As Standard
As Standard
Coal Capacity 6t 10cwt
As Standard
5t 0cwt
As Standard
As Standard
As Standard
As Standard

Boiler & Firebox
Standard Piston Valves No. 3292 No. 1421 No. 1300 No. 3279 C1 Booster
Boiler Diagram STD3
As Standard
As Standard
As Standard
As Standard
As Standard
As Standard
Boiler Pitch 8' 834"
As Standard
As Standard
As Standard
As Standard
As Standard
As Standard