Indian locomotive class PT

Indian locomotive class PT
Robert Stephenson & Co. work's photo of SIR No.10 (RSC No.4117)
Type and origin Power type Steam Designer British Engineering Standards Association Builder Kitson & Co. (F/FS class)[1] Robert Stephenson & Co. (SIR locomotives) Serial number 4114-4120 (SIR Lentz locomotives)[2] Build date 1936 (SIR locomotives)[2] Total produced 7 (SIR Lentz locomotives)[2]
Specifications Configuration: ​  • Whyte 2-6-4T  • UIC 1′C2′ n2t (PT class) 1′C2′ h2t (PTS/PTC class) Gauge 1,676 mm (5 ft 6 in) Leading dia. 3 ft 7 in (1,090 mm) Coupled dia. 5 ft 1+1⁄2 in (1,562 mm) Trailing dia. 3 ft 7 in (1,090 mm) Wheelbase: ​  • Engine 34 ft 3 in (10.44 m)  • Coupled 13 ft 0 in (3.96 m) Length: ​  • Over buffers 43 ft 7+1⁄2 in (13.297 m) Axle load 15 long tons (15 t) Loco weight 76.5 t (75.3 long tons; 84.3 short tons) Fuel capacity 3 t (3.0 long tons; 3.3 short tons) of coal. Water cap. 2,000 imp gal (9,100 L; 2,400 US gal) Firebox: ​  • Type Belpaire  • Grate area 25.3 sq ft (2.35 m2) Boiler: ​  • Diameter Standard type: 5 ft 1+1⁄4 in (1,556 mm) SP/SG type: 4 ft 8+1⁄2 in (1,435 mm) Boiler pressure 180 psi (12.4 bar; 12.7 kgf/cm2) Superheater Schmidt (PTS/PTC class) Cylinders Two, inside (Original design) Two, outside (SIR locomotives) Cylinder size 18.5 in × 26 in (470 mm × 660 mm) Valve gear Rotary Lentz (SIR locomotives) Walschaerts (Other locomotives)[1]
Career Disposition One SIR locomotive preserved, remainder scrapped.
Reference: [3][4][5] except where noted.

The PT class (Passenger Tank) was a broad gauge tank locomotive designed to haul passenger trains on the railways in British India. It was one of the BESA locomotives developed by the British Engineering Standards Committee, later called the British Engineering Standards Association (BESA).