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Prussian G 9 DRG Class 55.23–24 ČSD class 427.05 PKP Tp5 SNCB Type 79
Type and origin
Builder
Schichau-Werke
Hanomag
Henschel & Sohn
Borsig
Build date
1908–1911
Total produced
200
Specifications
Configuration:
• Whyte
0-8-0
Gauge
1,435 mm (4 ft 8+1⁄2 in)
Driver dia.
1,250 mm (4 ft 1+1⁄4 in)
Length:
• Over beams
16,758 mm (54 ft 11+3⁄4 in)
Axle load
15.2 t (15.0 long tons; 16.8 short tons)
Adhesive weight
59.0 t (58.1 long tons; 65.0 short tons)
Service weight
59.0 t (58.1 long tons; 65.0 short tons)
Water cap.
12.0 m3 (2,600 imp gal; 3,200 US gal)
Boiler pressure
12 kgf/cm2 (1,180 kPa; 171 lbf/in2)
Heating surface:
• Firebox
3.05 m2 (32.8 sq ft)
• Evaporative
197.58 m2 (2,126.7 sq ft)
Cylinders
2
Cylinder size
550 mm (21+5⁄8 in)
Piston stroke
630 mm (24+13⁄16 in)
Performance figures
Maximum speed
45 km/h (28 mph)
Indicated power
925 PS (680 kW; 912 hp)
Career
Numbers
DRG: 55 2301 – 55 2433
Retired
by 1961
The Prussian G 9 was the last saturated (i.e non-superheated) locomotive class developed for the Prussian state railways. A total of 200 were put into service between 1908 and 1911, first by Schichau, and later by other locomotive manufacturers. Since problems arose with the G 8, the superheated steam technology was not really trusted. The chassis was taken from the G 7, whereas the larger boiler was a new design. The G 9 remained inferior to the G 8 in terms of performance. At first a number of locomotives were referred to as G 7, but they were later reclassified G 9. They mainly operated in ore traffic between the Ruhr area and the North Sea.
After World War I, 58 locomotives were ceded to Belgium (type 79), eight to Poland for the Polish State Railways (PKP), who classified them as Tp5, and one locomotive to the Saarland.[1]
133 locomotives passed to Deutsche Reichsbahn and were given the fleet numbers 55 2301 to 55 2433. Thirty-six of them were fitted with superheaters in the 1920s, which led to an increase in performance and speed. The locomotives that survived World War II were either retired (in the western zones by 1949, in East Germany as the last in 1961, 55 2361) or sold to private railways.
After 1945, the ČSD had two locomotives. They were designated as series 427.05. They originally came from Poland, part of PKP's Tp5 series. In 1947 they were returned to the PKP.
The locomotives were equipped with a Prussian 3-axle tender, type pr 3 T 12, to diagram sheet III-5b.
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