Bavarian B XI

The Class B XI engines of the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn) were built between 1895 and 1900 by the firm of Maffei for deployment in Bavaria. The first delivery comprised 39 vehicles with two-cylinder, saturated steam operation, a further 100 two-cylinder compound locomotives followed in the period up to 1900.

Bavarian B XI Zwilling
(two-cylinder simple)
DRG Class 36.7–8
Type and origin
BuilderMaffei
Build date1892–1893
Total produced39
Specifications
Configuration:
​
 • Whyte4-4-0
Gauge1,435 mm (4 ft 8+1⁄2 in)
Leading dia.1,006 mm (3 ft 3+5⁄8 in)
Driver dia.1,870 mm (6 ft 1+5⁄8 in)
Wheelbase:
 • incl. tender
  • 12,895 mm (42 ft 3+3⁄4 in) 1
  • 13,970 mm (45 ft 10 in) 2
Length:
​
 • Over beams
  • 15,979 mm (52 ft 5 in) 1
  • 16,885 mm (55 ft 4+3⁄4 in) 2
Axle load14.3 t (14.1 long tons; 15.8 short tons)
Adhesive weight28.5 t (28.0 long tons; 31.4 short tons)
Service weight50.4 t (49.6 long tons; 55.6 short tons)
Tender weight36.0 or 43.0 t (35.4 or 42.3 long tons; 39.7 or 47.4 short tons)
Tender type
  • bay 3 T 14.5 or
  • bay 2′2′ T 18
Fuel capacity6.0 or 6.5 t (5.91 or 6.40 long tons; 6.61 or 7.17 short tons) of coal
Water cap.14.5 or 18.0 m3 (3,190 or 3,960 imp gal; 3,830 or 4,760 US gal)
Boiler pressure12 kg/cm2 (1,180 kPa; 171 lbf/in2)
Heating surface:
 • Firebox		2.24 m2 (24.1 sq ft)
 • Evaporative116.2 m2 (1,251 sq ft)
CylindersTwo, simple
Cylinder size430 mm (16+15⁄16 in)
Piston stroke610 mm (24 in)
Valve gearWalschaerts (Heusinger), outside
Performance figures
Maximum speed90 km/h (56 mph)
Career
Numbers
  • K.Bay.Sts.E.: 1201–1239
  • DRG: 36 701 – 36 708
Retiredby 1926
1 with bay 3 T 14.5 tender
2 with bay 2′2′ T 18 tender
Bavaian B XI Verbund
(two-cylinder compound)
DRG Class 36.7–8
Type and origin
Builder
Build date1895–1900
Total produced100
Specifications
Wheelbase:
 • incl. tender		14,095 mm (46 ft 3 in)
Length:
​
 • Over beams16,986 mm (55 ft 8+3⁄4 in)
Axle load
  • 14.4 t (14.2 long tons; 15.9 short tons)
  • 14.8 t (14.6 long tons; 16.3 short tons) 3
Adhesive weight
  • 28.8 t (28.3 long tons; 31.7 short tons)
  • 29.6 t (29.1 long tons; 32.6 short tons) 3
Service weight
  • 51.0 t (50.2 long tons; 56.2 short tons)
  • 51.5 t (50.7 long tons; 56.8 short tons) 3
Tender weight43.0 t (42.3 long tons; 47.4 short tons)
Tender typebay 2′2′ T 18
Fuel capacity6.5 t (6.40 long tons; 7.17 short tons) of coal
Water cap.18.0 m3 (3,960 imp gal; 4,760 US gal)
Boiler pressure13 kg/cm2 (1,270 kPa; 185 lbf/in2)
Heating surface:
 • Firebox		2.26 m2 (24.3 sq ft)
 • Evaporative116.8 m2 (1,257 sq ft)
CylindersTwo, compound
Piston stroke610 mm (24 in)
High-pressure cylinder455 mm (17+15⁄16 in)
Low-pressure cylinder670 mm (26+3⁄8 in)
Career
Numbers
  • K.Bay.Sts.E.: 1240–1339
  • DRG: 36 751 – 36 826
Retiredby 1931
3 from no. 1318
Only differences from above shown

The Deutsche Reichsbahn took over 8 engines from the first batch as Class 36.7, with operating numbers 36 701 to 36 708, and 76 of the second batch, with numbers 36 751 to 36 826.

These steam locomotives were equipped with Bavarian 3 T 12, 3 T 14.5 and 2'2' T 18 tenders. These vehicles were the first locos that were give a four-axle tender.

See also

References
    • This page incorporates a translation of the equivalent page on the German language Wikipedia
    • Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1976). Dampflokomotiven deutscher Eisenbahnen, Baureihe 01–39 (EFA 1.1) (in German) (3rd ed.). Düsseldorf: Alba Buchverlag. pp. 206–207. ISBN 3-87094-081-6.
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