The reference for locomotives and railcars


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German Reichsbahn class 0110
German Federal Railway classes 011 and 012
Germany | 1939 | 55 produced
01 1102 in June 2011 in Heilbronn after restoring the streamlined fairing
01 1102 in June 2011 in Heilbronn after restoring the streamlined fairing
Hugh Llewelyn

In order to develop a new express locomotive for speeds of up to 150 km/h, the design of the proven class 01 was used. These were already designed for 140 km/h and now they wanted to increase the usable speed range by means of a streamlined fairing. The fairing encompassed the entire locomotive, including the tender, and reached down to 400 mm above the railheads. Only on the coupling wheels was there a cut-out, e.g. to make it easier to lubricate the drive and coupling rods. The fairing had no effect at low speeds, but at over 120 km/h the drawbar power could be significantly increased.

Since the running smoothness of the original two-cylinder engine of the 01 left a lot to be desired even at its top speed, an engine with three cylinders was used for the 0110. Since the original engine was designed for only two cylinders, it was not entirely possible to ensure optimal steam distribution between the three cylinders. Although the locomotives thus achieved a lower indicated power than the 01, the advantages were the smoother running and the cladding. Instead of the initially required 550 tonnes of towing capacity at 120 km/h on the level, in reality they reached up to 660 tonnes at this speed.

In 1939 it was assumed that more than 400 locomotives would be required and initially a total of 204 units were ordered from several factories. Due to the outbreak of war, only 55 0110 were built. In everyday use, it became apparent that the streamlined fairing only had a positive effect at the rarely achieved high speeds, and it was also an obstacle to maintenance. Over time, the fairing was completely or partially removed from many locomotives.

After the war, all remaining pieces came to the Bundesbahn. They were mostly in very bad condition and were to be be retired, but due to the lack of locomotives they were rebuilt. All parts of the cladding were removed and boilers made of the problematic steel alloy St 47 K were replaced with new welded ones with a combustion chamber. The indicated power now reached 2,350 hp, and even 2,470 hp for oil-fired engines.

When the Bundesbahn switched to the computer numbering system in 1968, they renumbered the coal-fired units as class 011 and the oil-fired units as class 012. They remained indispensable until the electrification of the last main lines was completed and were retired by May 31, 1975.

Variantas builtnew boiler coal-firednew boiler oil-fired
Axle config4-6-2 (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length79 ft 2 in
Wheelbase40 ft 8 3/16 in
Fixed wheelbase15 ft 1 1/8 in
Total wheelbase66 ft 8 in
Empty weight227,296 lbs219,580 lbs222,667 lbs
Service weight251,988 lbs244,272 lbs246,036 lbs
Adhesive weight132,718 lbs
Total weight433,649 lbs423,287 lbs433,208 lbs
Axle load44,313 lbs
Water capacity10,039 us gal
Fuel capacity22,046 lbs (coal)3,566 us gal (oil)
Power sourcesteam
Indicated power2,091 hp (1,559 kW)2,317 hp (1,728 kW)2,437 hp (1,817 kW)
Optimal speed35 mph39 mph41 mph
Top speed93 mph87 mph
Starting effort37,841 lbf
Power Plant
Driver diameter78.7 in
Boiler pressure232 psi
Expansion typesimple
Cylindersthree, 19 11/16 x 26 in
Grate area46.5 sq ft42.6 sq ft
Firebox area181.9 sq ft236.8 sq ft
Tube heating area2,478.4 sq ft1,986 sq ft
Evaporative heating area2,660.3 sq ft2,222.9 sq ft
Superheater area925.7 sq ft1,034.9 sq ft
Total heating area3,586 sq ft3,257.8 sq ft
Calculated Values
steam locomotive
last changed: 01/2022

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