Indian locomotive class PT

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Indian locomotive class PT
South Indian Railways 2-6-4T steam locomotive Nr. PT 10 (Robert Stephenson Locomotive Works Nr. 4117 built 1936).jpg
Robert Stephenson & Co. work's photo of SIR No. 10 (RSC No. 4117)
Type and origin
Power typeSteam
Designer British Engineering Standards Association
Builder Kitson & Co. (F/FS class) [1]
Robert Stephenson & Co. (SIR locomotives)
Serial number4114-4120 (SIR Lentz locomotives) [2]
Build date1936 (SIR locomotives) [2]
Total produced7 (SIR Lentz locomotives) [2]
Specifications
Configuration:
​
 •  Whyte 2-6-4 T
 •  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:​
 • Engine34 ft 3 in (10.44 m)
 • Coupled13 ft 0 in (3.96 m)
Length:
​
 • Over buffers43 ft 7+1⁄2 in (13.297 m)
Axle load 15 long tons (15 t)
Loco weight76.5 t (75.3 long tons; 84.3 short tons)
Fuel capacity3 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 area25.3 sq ft (2.35 m2)
Boiler:
​
 • DiameterStandard type: 5 ft 1+1⁄4 in (1,556 mm)
SP/SG type: 4 ft 8+1⁄2 in (1,435 mm)
Boiler pressure180 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
DispositionOne SIR locomotive preserved, remainder scrapped.
Reference: [3] [4] [5] except where noted.

The Indian locomotive class PT (Passenger Tank) were a class of 2-6-4 T broad gauge passenger tank locomotives that were one of seven standard broad-gauge locomotive designs developed by the British Engineering Standards Committee (BESC, later the British Engineering Standards Association (BESA)) for the broad-gauge railways of British India.

Contents

History

The PT class was first catalogued in the second edition of the BESA report on standard locomotive classes for the railways of British India of 1907. [6] Robert Stephenson and Company built seven PT class locomotives for the South Indian Railway (SIR) in 1936, bearing works numbers 4114 to 4120. [2] This batch differed significantly from the earlier F and FS classes (which correlate to the original BESA design with internal valve gear) by being fitted with outside cylinders. [1] In service, the locomotives were used in heavy suburban traffic, and were numbered 7 to 13. [2] Number 11 has been preserved and is on display in the National Rail Museum of India in New Delhi. [7] [8]

Design

Drawing of the original design from the BESA's second report from 1907 (note the lack of external cylinders). BESA Standard 2-6-4 Type Tank Engine for Indian Railways.png
Drawing of the original design from the BESA's second report from 1907 (note the lack of external cylinders).

Three design variants of the PT class, each with different boilers, were listed in the 1907 BESC report. A larger standard boiler with a diameter of 5 ft 1 1⁄4 in (1556 mm) was developed for the PT, which was also listed as a variant in the third BESA report for the SP and SG class locomotives. [9] Alternatively, the existing boilers from the SP and SG classes could also be used, provided that the weight of the locomotive was altered in accordance with the requirements of the report. [6] The PTS variant was fitted with a Schmidt superheater - the S stands for superheated. [5] In contrast to the design recommendations of the BESA report, the SIR locomotives were fitted with external Lentz rotary valve gear. [1]

References

  1. 1 2 3 4 Hughes 1979, p. 70.
  2. 1 2 3 4 5 Historical Railway Images (8 January 2018). "India Railways - South Indian Railways 2-6-4T steam locomotive Nr. PT10 (Robert Stephenson Locomotive Works 4117 / 1936)" . Retrieved 30 August 2020.
  3. ↑ "History of Steam: Broad Gauge". www.indiansteamrailwaysociety.in. Archived from the original on 29 June 2016. Retrieved 18 July 2024.
  4. ↑ Second report of the Locomotive committee on standard locomotives for Indian railways. February 1907. p. 13. Retrieved 22 September 2024.
  5. 1 2 Hughes 1979, p. 18.
  6. 1 2 Second report of the Locomotive committee on standard locomotives for Indian railways. February 1907. p. 6. Retrieved 17 July 2024.
  7. ↑ Wojtkowiak, Maciej. "Steam Locomotive PT 11 Constructed in Britain and used also in India".
  8. ↑ Hughes 1979, p. 91.
  9. ↑ Indian Industries and Power, Volume 7. 1909. p. 275. Retrieved 17 July 2024.

Bibliography

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