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Specifications
Specifications
Configuration:;
• Whyte	2-4-4T
Gauge	1,435 mm (4 ft 8+1⁄2 in)
Leading dia.	1,006 mm (3 ft 3+5⁄8 in)
Driver dia.	1,640 mm (5 ft 4+5⁄8 in)
Trailing dia.	1,006 mm (3 ft 3+5⁄8 in)
Length:;
• Over beams	11,850 or 11,928 mm (38 ft 10+1⁄2 in or 39 ft 1+1⁄2 in)
Axle load	14.6 or 15.0 t (14.4 or 14.8 long tons; 16.1 or 16.5 short tons)
Adhesive weight	28.8 or 30.0 t (28.3 or 29.5 long tons; 31.7 or 33.1 short tons)
Service weight	68.8 or 67.5 t (67.7 or 66.4 long tons; 75.8 or 74.4 short tons)
Boiler pressure	12 or 13 kgf/cm2 (1,180 or 1,270 kPa; 171 or 185 lbf/in2)
Heating surface:
• Firebox	1.96 m2 (21.1 sq ft)
• Evaporative	104.63 m2 (1,126.2 sq ft)
Cylinders	Two
Cylinder size	450 mm (17+11⁄16 in)
Piston stroke	560 mm (22+1⁄16 in)

Type and origin
Type and origin
Builder	Krauss (Munich); Maffei; SACM (Grafenstaden);
Build date	1897–1912
Total produced	D XII: 96; P2.II: 31; Pt 2/5 N: 9; AL D33/T7/T5: 37; Total: 174;

Bavarian D XII, Pt 2/5 N
P 2.II (Palatinate)
DRG Class 73.0–1
Bavarian D XII, Pt 2/5 N ; P 2.II (Palatinate); DRG Class 73.0–1
Builder
Type and origin
Builder	Krauss (Munich); Maffei; SACM (Grafenstaden);
Build date	1897–1912
Total produced	D XII: 96; P2.II: 31; Pt 2/5 N: 9; AL D33/T7/T5: 37; Total: 174;
Configuration:;
Specifications
Configuration:;
• Whyte	2-4-4T
Gauge	1,435 mm (4 ft 8+1⁄2 in)
Leading dia.	1,006 mm (3 ft 3+5⁄8 in)
Driver dia.	1,640 mm (5 ft 4+5⁄8 in)
Trailing dia.	1,006 mm (3 ft 3+5⁄8 in)
Length:;
• Over beams	11,850 or 11,928 mm (38 ft 10+1⁄2 in or 39 ft 1+1⁄2 in)
Axle load	14.6 or 15.0 t (14.4 or 14.8 long tons; 16.1 or 16.5 short tons)
Adhesive weight	28.8 or 30.0 t (28.3 or 29.5 long tons; 31.7 or 33.1 short tons)
Service weight	68.8 or 67.5 t (67.7 or 66.4 long tons; 75.8 or 74.4 short tons)
Boiler pressure	12 or 13 kgf/cm2 (1,180 or 1,270 kPa; 171 or 185 lbf/in2)
Heating surface:
• Firebox	1.96 m2 (21.1 sq ft)
• Evaporative	104.63 m2 (1,126.2 sq ft)
Cylinders	Two
Cylinder size	450 mm (17+11⁄16 in)
Piston stroke	560 mm (22+1⁄16 in)
Maximum speed
Performance figures
Maximum speed	90 km/h (56 mph)
Numbers
Career
Numbers	K.Bay.Sts.B.; D XII: 2201–2296; Pt 2/5 N: 5205–5210,; Pfalzbahn: 88(2nd)…95(2nd), 260–262, 264–284; Saar Railways: 6601–6605; DRG:; P2.II: 73 001 – 73 028; D XII: 73 031 – 73 125; Pt 2/5 N: 73 131 – 73 139;
Retired	1948

The Bavarian Class D XII steam locomotives were manufactured by the firm of Krauss from 1897 for the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn). Ninety six of them were procured for service on the stub lines running from Munich into the mountains, but in reality they were stationed in many large Bavarian locomotive depots (Bahnbetriebswerke or Bw). Two engines were transferred to the Palatinate Railway (Pfalzbahn) in 1916, the remaining 94 later joined the Deutsche Reichsbahn fleet and were incorporated as DRG Class 73.0-1 with operating numbers 73 031–124.

The Palatinate Railway procured the almost identical Palatine P 2.II class in 31 examples during the years 1900 to 1903. 28 engines were taken over as 73 001–028 by the Deutsche Reichsbahn, the remaining three were handed over to the Saar Railway (Saarbahn).

Between 1903 and 1912, 37 engines went to the Imperial Railways in Alsace-Lorraine (Reichseisenbahnen in Elsaß-Lothringen) and were given the numbers T 5 6601–6637. One of these vehicles was taken over by the Deutsche Reichsbahn under operating number 73 125.

The Bavarian Pt 2/5 H built in 1906 as a one-off, had shown that the use of a superheater brought no clear gains due to the low coupled axle load. As a result, in 1907 nine similar machines with saturated steam operation were built, as the Bavarian Pt 2/5 N class. These engines were incorporated into the Deutsche Reichsbahn as numbers 73 131 to 73 139.

Most of the locomotives were retired by 1925; but several examples were still in the vehicle park until 1948.

References

Hütter, Ingo (2021). Die Dampflokomotiven der Baureihen 60 bis 91 der DRG, DRB, DB, und DR (in German). Werl: DGEG Medien. pp. 86–92. ISBN 978-3-946594-21-5.
Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1978). Dampflokomotiven deutscher Eisenbahnen, Baureihe 60–96 (EFA 1.3) (in German) (4th ed.). Düsseldorf: Alba. pp. 58–63. ISBN 3-87094-083-2.