Bavarian S 3/6

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Bavarian S 3/6 DRG Class 18.4
Bavarian S 3/6, Series a to c
Type and origin Build date 1908–1931 Total produced 159
Specifications Configuration: ​  • Whyte 4-6-2 Gauge 1,435 mm (4 ft 8+1⁄2 in) standard gauge Leading dia. 950 mm (37+3⁄8 in) Driver dia. 1,870 mm (73+5⁄8 in) Trailing dia. 1,206 mm (47+1⁄2 in) Length: ​  • Over beams 21,396 mm (70 ft 2+1⁄4 in) Axle load 16.8 t (16.5 long tons; 18.5 short tons) Adhesive weight 49.6 t (48.8 long tons; 54.7 short tons) Service weight 88.3 t (86.9 long tons; 97.3 short tons) Water cap. 26.2 m3 (5,800 imp gal; 6,900 US gal) Boiler pressure 15 kgf/cm2 (1.47 MPa; 213 lbf/in2) Heating surface: ​  • Firebox 4.53 m2 (48.8 sq ft)  • Evaporative 197.41 m2 (2,124.9 sq ft) Superheater: ​  • Heating area 74.16 m2 (798.3 sq ft) Cylinders 4, compound High-pressure cylinder 425 mm (16+3⁄4 in) Low-pressure cylinder 670 mm (26+3⁄8 in) Piston stroke HP: 610 mm (24 in) LP: 670 mm (26+3⁄8 in)
Performance figures Maximum speed 120 km/h (75 mph) Indicated power 1,770 PS (1,300 kW; 1,750 hp)
Career Numbers K.Bay.Sts.E.: 3601–3623, 3642–3709 DRG 18 401 – 18 434, 18 461 – 18 548 Retired by 1969

The Class S 3/6 steam locomotives of the Royal Bavarian State Railways (later Class 18.4-5 of the Deutsche Reichsbahn) were express train locomotives with a 4-6-2 Pacific (Whyte notation) or 2'C1' (UIC classification) wheel arrangement.

Of all the state railway locomotives, these engines are remarkable because they were made over a period of almost 25 years, even during the Deutsche Reichsbahn era. A total of 159 units were manufactured, more than all the other state railway Pacifics taken together. A total of 89 of these locomotives (Series a to i) were built for the Royal Bavarian State Railways and 70 (Series k to o) for the Deutsche Reichsbahn.