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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.

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Bavarian PtzL 3/4 DRG Class 97.1
Type and origin Builder Krauss (s/n 6632–6634, 8033) Build date July/August/September 1912, 1923 Total produced 4
Specifications Configuration: ​  • Whyte 0-6-2RT  • UIC C1′ h2(4v)t  • German Z 34.15 Gauge 1,435 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 system Emil Strub Length: ​  • Over beams 10,490 mm (34 ft 5 in) Axle load 15.6 tonnes (15.4 long tons; 17.2 short tons) Adhesive weight 46.2 t (45.5 long tons; 50.9 short tons) Service weight 57.8 t (56.9 long tons; 63.7 short tons) Fuel capacity Coal Water cap. 4 m3 (880 imp gal; 1,100 US gal) Boiler: ​ Heating tube length 3,800 mm (12 ft 5+1⁄2 in) Boiler pressure 12 kgf/cm2 (1,180 kPa; 171 lbf/in2) Heating surface:  • Firebox 1.85 m2 (19.9 sq ft)  • Evaporative 71.69 m2 (771.7 sq ft) Superheater: ​  • Heating area 25.40 m2 (273.4 sq ft) Cylinders Adhesive: 2 Rack: 4 Cylinder size 508 mm (20 in) Piston stroke 460 mm (18+1⁄8 in) Cogwheel drive cylinder bore 508 mm (20 in) Cogwheel drive piston stroke 460 mm (18+1⁄8 in) Transmission superheated steam, 2 cylinders in adhesive working, 4 compound cylinders in rack working Couplers Standard 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 Retired 1954 (1), May 1963 (3)

See also

• Royal Bavarian State Railways
• List of Bavarian locomotives and railbuses

References

• Weisbrod, Manfred; Petznik, Wolfgang (1981). Dampflokomotiven deutscher Eisenbahnen, Baureihe 97–99 (EFA 1.4) (in German) (2nd ed.). Düsseldorf: Alba. pp. 16–19, 188. ISBN 3-87094-087-5.

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