The reference for locomotives and railcars
Prussian T 52
German Reichsbahn class 720
Germany | 1899 | 30 produced
Standard variant
Standard variant
Die Lokomotive,April 1924

For operation between Berlin and Potsdam, a tank locomotive was needed that ran more smoothly than the T 51 at higher speeds. The solution was to do without the trailing axle and instead to use a laterally sliding bogie at the front.

30 of this variant were procured from Henschel and six more from Grafenstaden, which were delivered in 1899 and 1900. Despite the same size driving wheels and an unchanged top speed of 75 km/h, the running smoothness had improved significantly above 60 km/h. The disadvantage of the missing trailing axle, however, was the worse running properties when reversing, which meant that the T 52 was used on the Ringbahn (Berlin belt railway) instead of on the planned route. The special feature of the last two examples was the use of a Schmidt-type smoke tube superheater. Although no further production took place, they were superior to the conventional engines and also represented the first superheated locomotives in Prussia.

One of the two engines that were delivered from the factory with a superheater
One of the two engines that were delivered from the factory with a superheater
Die Lokomotive, January 1924

Of the 20 engines that existed in 1923, two were redesignated two years later by the Reichsbahn as the class 720 and retired the following year. In 1941, two examples came from the Eutin-Lübecker Eisenbahn-Gesellschaft to the Reichsbahn, which were identical in construction to the T 52 and had already been converted to superheated steam. They were given the same numbers as the previously retired engines. One of them was able to stay with the Deutsche Reichsbahn in the GDR until 1955.

ManufacturerHenschel, Grafenstaden
Axle config4-4-0T (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length35 ft 7 3/8 in38 ft 0 15/16 in
Wheelbase22 ft 9 5/8 in
Empty weight107,145 lbs111,333 lbs
Service weight123,900 lbs133,600 lbs
Adhesive weight70,460 lbs72,532 lbs
Axle load35,230 lbs36,817 lbs
Water capacity1,585 us gal
Fuel capacity4,409 lbs (coal)
Power sourcesteam
Estimated power536 hp (400 kW)738 hp (550 kW)
Optimal speed17 mph28 mph
Top speed47 mph
Starting effort19,808 lbf16,644 lbf
Power Plant
Driver diameter63 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 18 7/8 x 23 5/8 intwo, 17 5/16 x 23 5/8 in
Grate area18.2 sq ft17.9 sq ft
Firebox area93.6 sq ft
Tube heating area1,208.8 sq ft1,046.3 sq ft
Evaporative heating area1,302.4 sq ft1,139.9 sq ft
Superheater area312.2 sq ft
Total heating area1,302.4 sq ft1,452.1 sq ft
Calculated Values
steam locomotive
tank locomotive
last changed: 01/2022

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