Baden VI b

The Baden VI b was the first German tank locomotive with a 2-6-2 wheel arrangement. It was developed by the firm of Maffei for the Grand Duchy of Baden State Railways in order to provide faster services on the Höllentalbahn. As a result, the first six batches were given a firebox sloping to the rear. One striking feature was also the connecting pipe between the two steam domes.

Baden VI b DRG Class 75.1–3
Baden VIb, No. 279
Number(s)	G.Bad.St.E.: 4…389, 793–812, 1133–1152, 1193–1214 DRG: 75 101 … 75 302
Quantity	173
Manufacturer	Maffei (15) MBG Karlsruhe (158)
Year(s) of manufacture	1900–1923
Retired	1933–1965
Wheel arrangement	2-6-2T
Axle arrangement	1′C1′ n2t
Type	Pt 35.14
Track gauge	1,435 mm (4 ft 8 1⁄2 in)
Length over buffers	11,760 mm (38 ft 7 in)
Height	4,150 mm (13 ft 7 3⁄8 in)
Overall wheelbase	8,400 mm (27 ft 6 3⁄4 in)
Empty weight	50.8–52.1 t (50.0–51.3 long tons; 56.0–57.4 short tons)
Service weight	64.2–67.3 t (63.2–66.2 long tons; 70.8–74.2 short tons)
Adhesive weight	42.2–42.3 t (41.5–41.6 long tons; 46.5–46.6 short tons)
Axle load	14.1 t (13.9 long tons; 15.5 short tons)
Top speed	80 km/h (50 mph)
Driving wheel diameter	1,480 mm (4 ft 10 1⁄4 in)
Leading wheel diameter	990 mm (3 ft 3 in)
Trailing wheel diameter	990 mm (3 ft 3 in)
Valve gear	Walschaerts (Heusinger)
Cylinder bore	435 mm (17 1⁄8 in)
Piston stroke	630 mm (24 13⁄16 in)
Boiler Overpressure	13 kgf/cm2 (1.27 MPa; 185 lbf/in2)
No. of heating tubes	185–189
Heating tube length	4,050 mm (13 ft 3 1⁄2 in)
Grate area	1.83 m2 (19.7 sq ft)
Radiative heating area	8.0–8.7 m2 (86–94 sq ft)
Tube heating area	105.92–108.21 m2 (1,140.1–1,164.8 sq ft)
Evaporative heating area	113.91–118.62 m2 (1,226.1–1,276.8 sq ft)
Water capacity	7.0 m3 (1,500 imp gal; 1,800 US gal)
Fuel	3 t (2.95 long tons; 3.31 short tons) of coal
Brakes	Westinghouse air brake

After the first delivery of 15 examples from Maffei, the remaining batches, 2 to 11, were produced by the Maschinenbau-Gesellschaft Karlsruhe. The Deutsche Reichsbahn took over 164 engines, most of which survived World War II. The Deutsche Bundesbahn ended up with 117 vehicles. Their retirement from the DB began in 1957 and was completed when 75 299 was withdrawn in 1962. The Deutsche Reichsbahn in East Germany took its engines out of service between 1955 and 1965.

Within this class there were differences between the eleven individual batches in terms of overall length, weight, the height of the boiler axis above the rails and the shape of the water tanks.

None of this class is known to have been preserved.