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Bavarian PtzL 3/4
DRG Class 97.1
Type and origin
BuilderKrauss (s/n 6632–6634, 8033)
Build dateJuly/August/September 1912, 1923
Total produced4
Specifications
Configuration:
​
 • Whyte0-6-2RT
 • UICC1′ h2(4v)t
 • GermanZ 34.15
Gauge1,435 mm (4 ft 8+1⁄2 in)
Driver dia.1,006 mm (3 ft 3+5⁄8 in)
Trailing dia.800 mm (2 ft 7+1⁄2 in)
Rack systemEmil Strub
Length:
​
 • Over beams10,490 mm (34 ft 5 in)
Axle load15.6 tonnes (15.4 long tons; 17.2 short tons)
Adhesive weight46.2 t (45.5 long tons; 50.9 short tons)
Service weight57.8 t (56.9 long tons; 63.7 short tons)
Fuel capacityCoal
Water cap.4 m3 (880 imp gal; 1,100 US gal)
Boiler:
​
Heating tube length3,800 mm (12 ft 5+1⁄2 in)
Boiler pressure12 kgf/cm2 (1,180 kPa; 171 lbf/in2)
Heating surface:​
 • Firebox1.85 m2 (19.9 sq ft)
 • Evaporative71.69 m2 (771.7 sq ft)
Superheater:
​
 • Heating area25.40 m2 (273.4 sq ft)
Cylinders
  • Adhesive: 2
  • Rack: 4
Cylinder size508 mm (20 in)
Piston stroke460 mm (18+1⁄8 in)
Cogwheel drive cylinder bore508 mm (20 in)
Cogwheel drive piston stroke460 mm (18+1⁄8 in)
Transmissionsuperheated steam, 2 cylinders in adhesive working, 4 compound cylinders in rack working
CouplersStandard buffers with coupling hooks
Performance figures
Maximum speed
  • Adhesive: 45 km/h (28 mph)
  • Rack, 4101–03: 12 km/h (7.5 mph)
  • Rack, 4104: 18 km/h (11 mph)
Indicated power
  • Adhesive: 530 PS (390 kW; 523 hp)
  • Rack: 560 PS (412 kW; 552 hp)
Career
Numbers
  • K.Bay.Sts.E: 4101–4104
  • DRG: 97 101 – 97 104 in Passau shed
Retired1954 (1), May 1963 (3)

The Bavarian Class PtzL 3/4 engines with the Royal Bavarian State Railways (Königlich Bayerische Staats-Eisenbahnen) were rack railway locomotives whose cogwheel drive was designed for working on tracks with a Strub rack. In 1923 they were incorporated by the Deutsche Reichsbahn as DRG Class 97.1 (Baureihe 97.1) in their numbering plan. The locomotives remained on their regular route between Erlau and Wegscheid until the closure of this rack railway in 1963. The last journey was on 5 January 1963. They were scrapped in April 1964 at Simbach am Inn.

See also

References

Categories