The Baden Class IX b were German rack railway steam locomotives with the Grand Duchy of Baden State Railways, whose cogwheel drive was designed for running on track with a Riggenbach rack system.

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Baden IX b DRG Class 97.2
Baden 371 (Maschinenfabrik Esslingen 3546 of 1910)
Type and origin Builder Maschinenfabrik Esslingen Build date 1910 (4), 1921 (3) Total produced 7
Specifications Configuration: ​  • Whyte 0-6-2T  • UIC C1′ n2(4v)zt Gauge 1,435 mm (4 ft 8+1⁄2 in) Driver dia. 1,080 mm (3 ft 6+1⁄2 in) Trailing dia. 850 mm (2 ft 9+1⁄2 in) Wheelbase:  • Overall 5,050 mm (16 ft 6+3⁄4 in) Rack system Riggenbach rack system Length: ​  • Over beams 10.900 m (35 ft 9+1⁄4 in) Height 4,248 mm (13 ft 11+1⁄4 in) Axle load 14.3 tonnes (14.1 long tons; 15.8 short tons) Adhesive weight 42.8 tonnes (42.1 long tons; 47.2 short tons) Empty weight 45.3–45.6 tonnes (44.6–44.9 long tons; 49.9–50.3 short tons) Service weight 56.7–57.0 tonnes (55.8–56.1 long tons; 62.5–62.8 short tons) Fuel capacity Coal: 1.5 tonnes (1.5 long tons; 1.7 short tons) Water cap. 5,000 litres (1,100 imp gal; 1,300 US gal) Boiler: ​ No. of heating tubes 178 Heating tube length 3,200 or 3,850 mm (10 ft 6 in or 12 ft 7+1⁄2 in) Boiler pressure 14 kgf/cm2 (1.37 MPa; 199 psi) Heating surface:  • Tubes 89.43 or 107.5 m2 (962.6 or 1,157.1 sq ft)  • Firebox 1.8 m2 (19 sq ft)  • Radiative 8.2 m2 (88 sq ft)  • Evaporative 97.59–115.7 m2 (1,050.5–1,245.4 sq ft) Superheater: ​  • Heating area 25.15 m2 (270.7 sq ft) Cylinders 4 Cylinder size 450 mm (17+11⁄16 in) Piston stroke 550 mm (21+5⁄8 in) Cogwheel drive cylinder bore 450 mm (17+11⁄16 in) Cogwheel drive piston stroke 550 mm (21+5⁄8 in) Valve gear Walschaerts (Heusinger)
Performance figures Maximum speed Adhesion: 45 km/h (28 mph) Rack: 18 km/h (11 mph)
Career Numbers G.Bad.St.E.: 344, 345, 371, 736–739 DRG 97 201 – 97 204, 97 251 – 97 253 Retired mid-1930s

The locomotive was produced in two sub-classes, which were designated as IX b¹ and IX b². In 1925 they were grouped by the Deutsche Reichsbahn as DRG Class 97.2 within their renumbering plan. The engines were employed on the Höllentalbahn in the Black Forest until they were eventually and later replaced by DRG Class 85 locomotives.

See also

• Grand Duchy of Baden State Railway
• List of Baden locomotives and railbuses

References

• Lohr, Hermann; Thielmann, Georg (1988). Lokomotiv-Archiv Baden. transpress Berlin. ISBN 3-344-00210-4.
• Weisbrod, Manfred; Petznik, Wolfgang (1981). Dampflokomotiven deutscher Eisenbahnen, Baureihe 97–99 (EFA 1.4) (in German) (2nd ed.). Düsseldorf: Alba. pp. 19–22. ISBN 3-87094-087-5.