Bavarian S 3/6

Bavarian S 3/6
DRG Class 18.4
Bavarian S 3/6, Series a to c
Type and origin
Build date1908–1931
Total produced159
Specifications
Configuration:
 • Whyte4-6-2
Gauge1,435 mm (4 ft 8+12 in) standard gauge
Leading dia.950 mm (37+38 in)
Driver dia.1,870 mm (73+58 in)
Trailing dia.1,206 mm (47+12 in)
Length:
 • Over beams21,396 mm (70 ft 2+14 in)
Axle load16.8 t
(16.5 long tons; 18.5 short tons)
Adhesive weight49.6 t
(48.8 long tons; 54.7 short tons)
Service weight88.3 t
(86.9 long tons; 97.3 short tons)
Water cap.26.2 m3 (5,800 imp gal; 6,900 US gal)
Boiler pressure15 kgf/cm2 (1.47 MPa; 213 lbf/in2)
Heating surface:
 • Firebox4.53 m2 (48.8 sq ft)
 • Evaporative197.41 m2 (2,124.9 sq ft)
Superheater:
 • Heating area74.16 m2 (798.3 sq ft)
Cylinders4, compound
High-pressure cylinder425 mm (16+34 in)
Low-pressure cylinder670 mm (26+38 in)
Piston stroke
  • HP: 610 mm (24 in)
  • LP: 670 mm (26+38 in)
Performance figures
Maximum speed120 km/h (75 mph)
Indicated power1,770 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
Retiredby 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.