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German Reichsbahn class 84
Germany | 1935 | 12 produced
84 001 in photo paint job on a company photo
84 001 in photo paint job on a company photo

In the 1930s, the Müglitztalbahn in the Ore Mountains was converted from 750 mm gauge to standard gauge because more and more industrial companies were settling there and the narrow-gauge locomotives were no longer able to cope with the increased demands and the traffic on the road did not help. Now there was a need for a tank locomotive that could pull freight trains carrying paper, glass or metal goods. In addition to the maximum gradient of 3.6 percent, the curve radii were a challenge, reaching up to 139 m.

For this purpose, the class 84 was developed as a standard locomotive and initially delivered in two variants with different engines. The two examples from BMAG had a three-cylinder engine and a chassis with Schwarzkopff-Eckardt bogies. The latter were derived from the well-known Krauss-Helmholtz bogie, but here two coupled axles were connected. The running axle steered the second coupled axle, which in turn steered the first coupled axle with less deflection.

Two more pieces were delivered by Orenstein and Koppel, which had a Luttermöller axle drive. In this case, the outer coupling axles were designed to be laterally movable and connected to the adjacent ones via gear wheels. The running axles were mounted in a Bissel frame and these machines only had two cylinders.

Sectional drawing with dimensions
Sectional drawing with dimensions
Die Lokomotive, September/October 1938

In the end, the design of the BMAG was convincing, whereupon eight additional ones were procured. They remained in service on the original route for the time being and eleven of the twelve survived the Second World War, but badly damaged after a bomb attack. After the war, the locomotives remained in the Ore Mountains, where they were used to transport uranium ore, among other things. Their decommissioning took place between 1966 and 1968. Some sources say that all machines were retired as early as 1958, that a planned reconstruction did not materialize due to the small number of units and that they were scrapped after a few years of service.

Variantproduction variant84 003 and 004
General
Built1935-1937
ManufacturerBMAGO&K
Axle config2-10-2T (Santa Fé) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length51 ft 0 3/16 in52 ft 3 15/16 in
Wheelbase38 ft 4 5/8 in
Fixed wheelbase0 ft 0 in
Empty weight221,564 lbs222,446 lbs
Service weight275,578 lbs276,018 lbs
Adhesive weight200,620 lbs197,754 lbs
Axle load40,345 lbs39,683 lbs
Water capacity3,698 us gal
Fuel capacity6,614 lbs (coal)
Power
Power sourcesteam
Indicated power1,407 hp (1,049 kW)
Optimal speed17 mph
Top speed50 mph
Starting effort54,059 lbf51,897 lbf
Power Plant
Driver diameter55.1 in
Boiler pressure232 psi
Expansion typesimple
Cylindersthree, 19 11/16 x 26 intwo, 23 5/8 x 26 in
Boiler
Grate area40.5 sq ft
Evaporative heating area2,260.4 sq ft
Superheater area914.9 sq ft
Total heating area3,175.4 sq ft
Calculated Values
steam locomotive
freight
tank locomotive
last changed: 01/2022
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