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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) Build date 1936 (SIR locomotives) Total produced 7 (SIR Lentz locomotives)
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) [2] 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.

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).

The PT class was first catalogued in the second edition of the standard from 1907. Robert Stephenson and Company built seven locomotives for the South Indian Railway (SIR) in 1936, bearing the works numbers 4114 to 4120. This batch differed significantly from the earlier F and FS classes (which correlate to the original BESA design with internal valve gear) by having outside cylinders. ^[1] In service, the locomotives were used in heavy suburban traffic, and were numbered 7 to 13. ^[3] Number 11 has been preserved and is on display in the National Rail Museum of India in New Delhi. ^{[4] [5]}

The locomotive was listed in the BESA standard in three variants, which differed in the steam boilers used. A larger standard boiler with a diameter of 5 ft 1 1⁄4 in (1556 mm) was developed for the PT, which was also provided as a variant in the third BESA standard for the SP and SG series locomotives. ^[6] Alternatively, the existing boiler from the SP and SG series could also be used, provided that the weight of the locomotive was adjusted in accordance with the requirements of the standard. ^[7] The PTS variant used a boiler with a Schmidt superheater - the S stands for superheated. In the PT series, external cylinders and Belpaire firebox were used, with the grate being arranged between the coupling wheel sets and therefore being relatively narrow. In contrast to the standard, the SIR locomotives were equipped with a valve gear with a rotating camshaft from the Lentz system. ^[1]

Wikimedia Commons has media related to Indian locomotive class PT.

• Maciej Wojtkowiak. "Steam Locomotive PT 11 Constructed in Britain and used also in India". Alamy. Retrieved 2020-08-30. PT Locomotive in National Rail Museum of India in New Delhi

• Hughes, Hugh (1979). Steam locomotives in India. Harrow, Middlesex: The Continental Railway Circle. ISBN  978-0-9503469-4-6.