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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.

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Bavarian B XI Zwilling (two-cylinder simple) DRG Class 36.7–8
Type and origin Builder Maffei Build date 1892–1893 Total produced 39
Specifications Configuration: ​  • Whyte 4-4-0 Gauge 1,435 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 load 14.3 t (14.1 long tons; 15.8 short tons) Adhesive weight 28.5 t (28.0 long tons; 31.4 short tons) Service weight 50.4 t (49.6 long tons; 55.6 short tons) Tender weight 36.0 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 capacity 6.0 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 pressure 12 kg/cm2 (1,180 kPa; 171 lbf/in2) Heating surface:  • Firebox 2.24 m2 (24.1 sq ft)  • Evaporative 116.2 m2 (1,251 sq ft) Cylinders Two, simple Cylinder size 430 mm (16+15⁄16 in) Piston stroke 610 mm (24 in) Valve gear Walschaerts (Heusinger), outside
Performance figures Maximum speed 90 km/h (56 mph)
Career Numbers K.Bay.Sts.E.: 1201–1239 DRG: 36 701 – 36 708 Retired by 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 Maffei Krauss Build date 1895–1900 Total produced 100
Specifications Wheelbase:  • incl. tender 14,095 mm (46 ft 3 in) Length: ​  • Over beams 16,986 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 weight 43.0 t (42.3 long tons; 47.4 short tons) Tender type bay 2′2′ T 18 Fuel capacity 6.5 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 pressure 13 kg/cm2 (1,270 kPa; 185 lbf/in2) Heating surface:  • Firebox 2.26 m2 (24.3 sq ft)  • Evaporative 116.8 m2 (1,257 sq ft) Cylinders Two, compound Piston stroke 610 mm (24 in) High-pressure cylinder 455 mm (17+15⁄16 in) Low-pressure cylinder 670 mm (26+3⁄8 in)
Career Numbers K.Bay.Sts.E.: 1240–1339 DRG: 36 751 – 36 826 Retired by 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

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

References

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