King
Edward II Project
Specifications of GWR 4 Cylinder 4-6-0s
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| Star class | Castle class | King Class | |
| Built at Swindon | 1906-1923 | 1923-1950 | 1927-1930 |
| Number built | 73 | 171 | 30 |
| Wheel arrangement | 4-6-0 | 4-6-0 | 4-6-0 |
| Weight of engine (full) | 75tons 12cwt | 79tons 17cwt | 89tons 0cwt |
| Weight of tender (full) | 46tons 14cwt | 46tons 14cwt | 46tons 14cwt |
| Driving wheel diameter | 6' 8½" | 6' 8½" | 6ft 6in |
| Bogie wheel diameter | 3'2" | 3'2" | 3'0" |
| Valve gear | Inside Walschaerts | Inside Walschaerts | Inside Walschaerts |
| Boiler barrel length | 14'10" | 14'10" | 16'0" |
| Boiler diameter | 4'1013/16" | 5'115/16" | 5'61/4" |
| Boiler outside diameter | 5'6" | 5'9" | 6'0" |
| Firebox length (outside) | 9'0" | 10'0" | 11'6" |
| Heating surface | 2,104 sq ft | 2,312 sq ft | 2,490 sq ft |
| Grate area | 27.07 sq ft | 29.36 sq ft | 34.3sq ft |
| Boiler pressure | 225lb/psi | 225lb/psi | 250lb/psi |
| Cylinders (4) Bore x Stroke | 15" x 26" | 16" x 26" | 16¼" x 28" |
| Water capacity | 4,000 gallons | 4,000 gallons | 4,000 gallons |
| Tractive effort at 85% boiler pressure | 27,800lbs | 31,625lbs | 40,300lbs |