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Czechoslovak State Railways class 477.0
Czechoslovakia | 1950 | 60 produced
477.043 in October 2015 in Prague-Dejvice
477.043 in October 2015 in Prague-Dejvice
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For suburban trains, the ČSD developed a tank locomotive with a 4-8-4 wheel arrangement, which was developed using the latest design principles. It was based on the single class 475.0 tank locomotive and the four class 476.0 tank locomotives. At the time of delivery, they were the largest tank locomotives in Europe.

The boiler had a combustion chamber, a mechanical stoker, a rocking grate and a double Kylchap blastpipe. There were also Trofimoff valves, power reverser and roller bearings. The three cylinders worked with simple expansion. Visually, the locomotives were clearly reminiscent of the German standard locomotives, especially with their Witte smoke deflectors and the steps at the front.

The first 38 locomotives were put into service as class 476.1. Due to the water reserves, they were very rear-heavy, which caused an uneven distribution of the loads on the driving axles. On the remaining 22 locomotives, the rear storage tanks were shortened by 30 cm and the side water tanks were lengthened to the front. To optimize the boiler's performance, the combustion chamber has been lengthened, thereby shortening the tubes and flues. These locomotives were designated as the class 477.0 and all earlier ones were rebuilt in the same way.

They were primarily used in the area of large cities in front of passenger trains, but also in front of freight trains if necessary. During test runs, speeds of up to 115 km/h were reached and 96 km/h were possible on flat land with an 800-tonne train. The same weight could be transported at 0.5 percent at 53 km/h and at one percent at 35 km/h.

The class 477.0 was not phased out until 1971. With the electrification of many lines and the introduction of more and more diesel locomotives, they gradually disappeared until 1981 when none were in use anymore. Three are still operational today, the 477.060 had even been in the Augsburg railway park for a few years since 2009.

General
Built1950-1955
ManufacturerČKD
Axle config4-8-4T (Northern) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length56 ft 9 1/8 in
Wheelbase45 ft 11 3/16 in
Fixed wheelbase19 ft 0 3/8 in
Empty weight237,438 lbs
Service weight288,144 lbs
Adhesive weight151,457 lbs
Axle load37,919 lbs
Water capacity3,963 us gal
Fuel capacity15,432 lbs (coal)
Power
Power sourcesteam
Indicated power2,131 hp (1,589 kW)
Optimal speed35 mph
Top speed62 mph
Starting effort38,871 lbf
Power Plant
Driver diameter64 in
Boiler pressure232 psi
Expansion typesimple
Cylindersthree, 17 11/16 x 26 3/4 in
Boiler
Grate area46.3 sq ft
Firebox area192.5 sq ft
Tube heating area2,033.8 sq ft
Evaporative heating area2,226.3 sq ft
Superheater area641.5 sq ft
Total heating area2,867.8 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
last changed: 06/2023
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