|
| |
| |
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 |
A handful of express locomotives equalled the tractive effort of the Kings,
and all benefited from the 'King' design.
On the London, Midland and Scottish Railway, Sir William Stanier's 'Princess
Royal' and 'Princess Coronation' pacific (4-6-2 wheel arrangement ) classes of
the 1930s both topped 40,000lbs.
The London & North Eastern Railway, would have to wait until 1947 to take the
title by only 130lbs with Arthur Peppercorn's superb A2 pacifics at 40,430lbs.
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6023 King Edward II Project
