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Bavarian Pt 2/3
German Reichsbahn class 700
Germany | 1909 | 97 produced
Die Lokomotive, April 1919

The Pt 2/3 was a tank locomotive that was developed for lighter passenger trains and was delivered by Krauss a total of 97 times between 1909 and 1916. It prevailed in testing against the Pt 2/4 N.

Thanks to a superheater, it was now possible to build small locomotives with the simple 2-4-0T wheel arrangement that were still powerful. However, this arrangement of the axles was not derived from the classic 2-4-0 passenger locomotive, but was more in the tradition of the 2-2-0T branch line tank locomotives with a long wheelbase. By adding another coupled axle that can be shifted laterally by 25 mm at a minimal distance from the driving axle, a radially adjustable leading axle could be dispensed with. With this arrangement, a lightweight construction of the locomotive was possible, which consequently also reduced consumption and thus operating costs.

As with other smaller Bavarian tank locomotives, there was a passage at the rear. In order to save costs, the fireman had to take on the role of conductor at the same time. Later, the passage was eliminated in favor of a larger coal box. Another change, which was carried out until 1937, was the exchange of the rigidly installed leading axle for a bissel axle. 50 of the engines were converted in this way and now had the UIC wheel arrangement 1'B instead of 1B.

 70 083 in August 2008 in Zwiesel
70 083 in August 2008 in Zwiesel
Konrad Lackerbeck

In 1925, the Reichsbahn included all the engines built as numbers 70 001 to 70 097 in their inventory. After the war, the Bundesbahn took over all 89 remaining examples and used them in southern Germany. Due to their economic efficiency, they remained in use for longer and so the last one was only retired in 1963. Today only road number 70 083 is still operational. Four examples remained in Austria after the Second World War and were used by the ÖBB as class 770. One of these was used in Austria from 1999, but has now been taken to a museum.

Variant6001-60026003-60916092-6097
General
Built1909-1916
ManufacturerKrauss
Axle config2-4-0T (Porter) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length29 ft 8 7/8 in30 ft 0 13/16 in30 ft 4 3/4 in
Wheelbase17 ft 10 9/16 in18 ft 0 9/16 in
Fixed wheelbase17 ft 10 9/16 in18 ft 0 9/16 in
Service weight84,657 lbs87,082 lbs87,964 lbs
Adhesive weight59,966 lbs62,391 lbs62,611 lbs
Axle load29,983 lbs31,085 lbs31,306 lbs
Fuel capacitycoal
Power
Power sourcesteam
Indicated power416 hp (310 kW)
Optimal speed21 mph
Top speed40 mph
Starting effort12,895 lbf
Power Plant
Driver diameter49.2 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 14 3/4 x 19 11/16 in
Boiler
Grate area13.1 sq ft
Firebox area58.1 sq ft
Tube heating area567.2 sq ft
Evaporative heating area625.3 sq ft
Superheater area197.6 sq ft
Total heating area822.9 sq ft
Calculated Values
steam locomotive
passenger
secondary line
tank locomotive
last changed: 01/2022
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