The Locomotive That Was Never Built.
In 1943 the former German State Railroad offered several locomotive builders the commission of developing an extra powerful freight locomotive. The chief requirements: Be able to pull 1,700 tons up an 0.8% grade on a 360 meter (1,181') curve while maintaining a speed of 20 km/h (12.5 mph), have a top speed of 80 km/h (50 mph) forward and reverse and an axle loading of 20 tons, be able to negotiate switches 1:7 with 140 meter (459') curves and fit on a 23 meter (75'6") turntable.
Further, the locomotive had to be manufactured as rationally as possible, given the technology available at the time. Among the designs were two Borsig proposals. Borsig design I proposed a (1'C) Dh4G 78.20 (2-6-8-0). The boiler was to have a diameter of about 2 to 2.2 meters (6'6" to 7'3"). The flues were 6 meters (39'). It was to have two sets of drivers, each with 2 cylinders, and the boiler was to rest on a pivoting bolster.
Design by Borsig for the former German State Railroad (DR). 4 axles powered. 4 traction tires. Illuminated double headlight at front of locomotive and on tender. Metal boiler and frame. Coupling hook in front, RELEX coupler on tender. Length over buffers 31.4 cm (12-3/8").
