Prussian T 12

T 12 (Prussia, Alsace-Lorraine)
DRG Class 74.4–13
ÖBB 674, PKP OKi2
SNCB/NMBS type 96
Type and origin
Builder
Build date1902–1921
Total produced1,014
Specifications
Configuration:
 • Whyte2-6-0T
 • GermanPt 34.17
Gauge1,435 mm (4 ft 8+12 in)
Leading dia.1,000 mm (3 ft 3+38 in)
Driver dia.1,500 mm (4 ft 11 in)
Length:
 • Over beams
  • 11,800 mm (38 ft 8+12 in)
  • 12,100 mm (39 ft 8+12 in)
Axle load17.36 tonnes (17.09 long tons; 19.14 short tons)
Adhesive weight50.50 tonnes (49.70 long tons; 55.67 short tons)
Service weight65.90 tonnes (64.86 long tons; 72.64 short tons)
Boiler pressure12 bar (1.20 MPa; 174 psi)
Heating surface:
 • Firebox1.69 m2 (18.2 sq ft)
 • Evaporative105.37 m2 (1,134.2 sq ft)
Superheater:
 • Heating area33.40 m2 (359.5 sq ft)
Cylinder size540 mm (21+14 in)
Piston stroke630 mm (24+1316 in)
Performance figures
Maximum speed80 km/h (50 mph)
Indicated power640–669 kW (870–910 PS; 858–897 hp)
Career
NumbersDRG 74 401–543, 545–1321
Retired1968

The Prussian Class T 12 were early German passenger tank locomotives built for the Prussian state railways in large numbers. These locomotives were superheated variants of the T 11.