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London, Midland & Scottish Coronation class

Great Britain 1937 38 produced
No. 46224 “Princess Alexandra” at Polmadie shed flickr/Historical Railway Images PD

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. 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 No. 6233 “Duchess of Sutherland” is the only one of the three surviving that was operational in 2023, but was withdrawn without further notice.

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

Technical data

General

Built
1937-1948
Manufacturers
Crewe
Wheel arrangement
4-6-2 (Pacific)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Wheelbase
11.28 m
Total wheelbase
19.18 m
Service mass
108.1 t
Adhesion mass
68.2 t
Total mass
166 t
Rigid wheelbase
4.42 m
Axle load
22.9 t
Water capacity
18,185 l
Fuel capacity
10.2 t (coal)

Boiler

Grate area
4.645 m²
Firebox surface
21.414 m²
Tube heating surface
258.735 m²
Evaporative heating surface
280.149 m²
Superheater surface
79.153 m²
Total heating surface
359.3 m²

Power plant

Driver diameter
2,057 mm
Boiler pressure
17.2 bar
Expansion type
simple expansion
Cylinders
four, 419 x 711 mm

Power

Power source
steam
Estimated power
2,461 kW (3,346 PS)
Starting effort
177.9 kN

Calculated values

Factor of adhesion
1 : 3.76
Optimal speed
85 km/h
Power-to-weight ratio
22.8 kW/t
Heating Surface Equivalent
545.5 m²
Cylinder volume/HSE
1 : 719.39
Adhesive weight/Total
1 : 1.59
Tractive force/Heating surface
1 : 10.34
Grate area/Heating surface
1 : 77.35
Firebox/Tube surface
1 : 12.08
Total/Superheater
1 : 3.54

Topics

  • steam locomotive
  • express
  • streamline
  • William Arthur Stanier
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Last changed: 12/2023

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