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London, Midland & Scottish Coronation class
Great Britain | 1937 | 38 produced
No. 46224 “Princess Alexandra” at Polmadie shed
No. 46224 “Princess Alexandra” at Polmadie shed
flickr/Historical Railway Images

For a new non-stop train between London and Glasgow, the LMS commissioned a new Pacific in the mid-1930s, which was supposed to be stronger, more reliable and easier to maintain than the Princess Royal. The train was called “Coronation Scot” and the locomotive “Coronation class”. The ten locomotives from the first batch and ten more from a later batch were built streamlined. This was apparently not planned at the beginning, but was subsequently decided due to the public appeal of the competing LNER A4.

No. 6241 “City of Edinburgh” with streamlining
No. 6241 “City of Edinburgh” with streamlining
flickr/Historical Railway Images

No. 6220 “Coronation” achieved a British record of 114 mph (183 km/h) in 1937, which only lasted one year. Another record was also broken in 1939 with 2,511 hp on the drawbar, which still stands today for British steam locomotives. The streamlined paneling was removed from all locomotives by 1948 because the advantages over the much more complicated maintenance were limited. Most were scrapped between 1962 and 1964 after they were replaced by electric locomotives and no further use could be found. No. 6233 “Duchess of Sutherland” is the only one of the three surviving that was operational in 2023, but was withdrawn without further notice.

General
Built1937-1948
ManufacturerCrewe
Axle config4-6-2 (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase37 ft
Fixed wheelbase14 ft 6 in
Total wheelbase62 ft 11 in
Service weight238,336 lbs
Adhesive weight150,304 lbs
Total weight365,904 lbs
Axle load50,400 lbs
Water capacity4,804 us gal
Fuel capacity22,400 lbs (coal)
Power
Power sourcesteam
Estimated power3,300 hp (2,461 kW)
Optimal speed53 mph
Starting effort39,997 lbf
Power Plant
Driver diameter81 in
Boiler pressure250 psi
Expansion typesimple
Cylindersfour, 16 1/2 x 28 in
Boiler
Grate area50 sq ft
Firebox area230.5 sq ft
Tube heating area2,785 sq ft
Evaporative heating area3,015.5 sq ft
Superheater area852 sq ft
Total heating area3,867.5 sq ft
Calculated Values
steam locomotive
express
streamline
William Arthur Stanier
last changed: 12/2023
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