Prussian T 6

Prussian T 6 PKP OKl1
Quantity	12
Manufacturer	Berliner Maschinenbau
Year(s) of manufacture	1902
Retired	Early 1920s
Wheel arrangement	2-6-2T
Axle arrangement	1′C1′ n3t
Track gauge	1,435 mm (4 ft 8+1⁄2 in)
Length over buffers	13,400 mm (43 ft 11+1⁄2 in)
Service weight	79.0 t (77.8 long tons; 87.1 short tons)
Adhesive weight	48.8 t (48.0 long tons; 53.8 short tons)
Axle load	16.6 t (16.3 long tons; 18.3 short tons)
Top speed	75 km/h (47 mph)
Driving wheel diameter	1,500 mm (4 ft 11 in)
Leading wheel diameter	1,000 mm (3 ft 3+3⁄8 in)
Trailing wheel diameter	1,000 mm (3 ft 3+3⁄8 in)
No. of cylinders	3
Cylinder bore	500 mm (19+11⁄16 in)
Piston stroke	630 mm (24+13⁄16 in)
Boiler Overpressure	14 kgf/cm2 (1.37 MPa; 199 lbf/in2)
Grate area	2.30 m2 (24.8 sq ft)
Evaporative heating area	154.50 m2 (1,663.0 sq ft)
Water capacity	6.7 m3 (1,500 imp gal; 1,800 US gal)
Fuel	2.5 t (5,500 lb) of coal

The T 6 of the Prussian State Railways were a class of twelve passenger tank locomotives. They were intended as an alternative to the Prussian T 11 and T 12 classes on the routes of the Berlin Stadt (city), Ring and suburban network. A total of twelve locomotives were built in 1902 by Berliner Maschinenbau AG. Two went to the Altona Division, the other ten to the Berlin Division. The design was unusual – being a three-cylinder design. In comparison to the T 11 and T 12, they were the least economical of the three classes. They were also other technical reasons why no more T 6 locomotives were built.^[1][2]

The locomotives were later dispersed to other railway divisions. After World War I, five went to the Polish State Railways (PKP), who classified them as OKl1. The locomotives that remained in Germany were retired by the early 1920s^[2]

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