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{{Short description|Indian steam locomotive class}}

{{Infobox locomotive
| name = Indian locomotive class PT
| bgcolor =
| color =
| image = File:South Indian Railways 2-6-4T steam locomotive Nr. PT 10 (Robert Stephenson Locomotive Works Nr. 4117 built 1936).jpg
| alt =
| caption = [[Robert Stephenson & Co.]] work's photo of SIR No. 10 (RSC No. 4117)
| powertype = Steam
| designer = [[British Engineering Standards Association]]
| builder = [[Kitson & Co.]] (F/FS class){{sfn|Hughes|1979|p=70}} [[Robert Stephenson & Co.]] (SIR locomotives)
| ordernumber =
| serialnumber = 4114-4120 (SIR Lentz locomotives)<ref name=flickr/>
| buildmodel =
| builddate = 1936 (SIR locomotives)<ref name=flickr/>
| totalproduction = 7 (SIR Lentz locomotives)<ref name=flickr/>
| rebuilder =
| rebuilddate =
| numberrebuilt =
| whytetype = {{whyte|2-6-4|T}}
| uicclass = 1{{prime}}C2{{prime}} n2t (PT class) 1{{prime}}C2{{prime}} h2t (PTS/PTC class)
| DRGtype =
| driver = 
| gauge = {{track gauge|1676mm}}
| leadingdiameter = {{convert|3|ft|7|in|mm|abbr=on}}
| driverdiameter = 
| coupleddiameter = {{convert|5|ft|1+1⁄2|in|mm|abbr=on}}
| trailingdiameter = {{convert|3|ft|7|in|mm|abbr=on}}
| tenderdiameter = 
| carrydiameter =
| minimumcurve =
| wheelbase =
| wheelspacing = 
| engine total = {{convert|34|ft|3|in|m|abbr=on}}
| leading =
| drivers = 
| coupled = {{convert|13|ft|0|in|m|abbr=on}}
| trailing =
| tender total =
| tendertruck = 
| tenderbogie = 
| wheelbasewithtender =
| racksystem =
| pivotcentres = 
| length =
| over couplers =
| over headstocks =
| over buffers = {{convert|43|ft|7+1/2|in|m|abbr=on}}
| width =
| height =
| frametype =
| axleload = {{convert|15|LT}}
| leadingbogie/pony= 
| coupled all = 
| coupled 1 = 
| coupled 2 = 
| coupled 3 = 
| coupled 4 =
| coupled 5 =
| coupled 6 =
| coupled 7 =
| coupled 8 =
| trail bogie/pony= 
| tenderbogieload = 
| tenderaxle = 
| weightondrivers =
| emptyweight =
| serviceweight =
| locoweight = {{convert|76.5|t|LT ST|abbr=on}}
| tenderweight =
| locotenderweight =
| tendertype =
| fueltype =
| fuelcap = {{convert|3|t| LT ST|abbr=on}} of coal.
| watercap = {{convert|2000|impgal|abbr=on}}
| tendercap =
| sandcap =
| fireboxtype = [[Belpaire firebox|Belpaire]]
| firearea = {{convert|25.3|sqft|m2|abbr=on}}
| boiler = 
| boilertype = 
| pitch = 
| diameterinside = Standard type: {{convert|5|ft|1+1/4|in|mm|0|abbr=on}} [[Indian locomotive class SP|SP]]/[[Indian locomotive class SG|SG]] type: {{convert|4|ft|8+1/2|in|mm|0|abbr=on}}
| lengthinside = 
| smalltubediameter= 
| largetubediameter= 
| boilerpressure = {{convert|180|psi|bar kgf/cm2|sigfig=3|abbr=on}}
| safetyvalvetype = 
| feedwaterheater =
| fireboxarea =
| tubearea =
| archarea =
| fluearea =
| tubesandflues =
| totalsurface =
| superheatertype = [[Wilhelm Schmidt (engineer)|Schmidt]] (PTS/PTC class)
| superheaterarea =
| cylindercount = Two, inside (Original design) Two, outside (SIR locomotives)
| cylindersize = {{convert|18.5|x|26|in|mm|0|abbr=on}}
| hpcylindersize =
| lpcylindersize =
| cogwheelbore =
| cogwheelstroke =
| cylinderpressure =
| valvegear = Rotary [[Lentz valve gear|Lentz]] (SIR locomotives) [[Walschaerts valve gear|Walschaerts]] (Other locomotives){{sfn|Hughes|1979|p=70}}
| valvetype =
| valvetravel =
| valvelap =
| valvelead =
| transmission =
| trainheating =
| locobrakes =
| locobrakeforce =
| trainbrakes =
| safety =
| coupling =
| maxspeed =
| indicatedpower =
| poweroutput =
| tractiveeffort =
| factorofadhesion =
| operator =
| operatorclass =
| powerclass =
| numinclass =
| fleetnumbers =
| officialname =
| nicknames =
| axleloadclass =
| locale =
| deliverydate =
| firstrundate =
| lastrundate =
| retiredate =
| withdrawndate =
| preservedunits =
| restoredate =
| scrapdate =
| currentowner =
| disposition = One SIR locomotive preserved, remainder scrapped.
| notes = Reference: <ref>{{cite web |url=http://www.indiansteamrailwaysociety.in/broad-gauge.php |title=History of Steam: Broad Gauge |author= |date= |website=www.indiansteamrailwaysociety.in |publisher= |archive-url=https://web.archive.org/web/20160629075526/http://www.indiansteamrailwaysociety.in/broad-gauge.php |access-date=18 July 2024 |archive-date=29 June 2016 |quote=}}</ref><ref>{{cite book |author= |date=February 1907 |title=Second report of the Locomotive committee on standard locomotives for Indian railways. |url=https://babel.hathitrust.org/cgi/pt?id=osu.32435015707664&seq=43 |location= |publisher= |page=13 |isbn=|access-date=22 September 2024}}</ref>{{sfn|Hughes|1979|page=18}} except where noted.
}}

The '''Indian locomotive class PT''' (Passenger Tank) were a class of {{whyte|2-6-4|T}} [[5 ft 6 in gauge railway|broad gauge]] [[Passenger train|passenger]] [[tank locomotive]]s
that were one of seven standard broad-gauge locomotive designs developed by the [[British Standards Institution|British Engineering Standards Committee]] (BESC, later the British Engineering Standards Association (BESA)) for the broad-gauge [[Rail transport in India|railways]] of [[British Raj|British India]].

==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.<ref name=BESA2/> [[Robert Stephenson and Company]] built seven PT class locomotives for the [[South Indian Railway]] (SIR) in 1936, bearing works numbers 4114 to 4120.<ref name=flickr/> 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.{{sfn|Hughes|1979|p=70}} In service, the locomotives were used in heavy suburban traffic, and were numbered 7 to 13.<ref name=flickr>{{cite web |access-date=30 August 2020 |author=Historical Railway Images |date=8 January 2018 |title=India Railways - South Indian Railways 2-6-4T steam locomotive Nr. PT10 (Robert Stephenson Locomotive Works 4117 / 1936) |url=https://www.flickr.com/photos/124446949@N06/38688875175/}}</ref> Number 11 has been preserved and is on display in the [[National Rail Museum, New Delhi|National Rail Museum of India]] in New Delhi.<ref>{{Cite web |last=Wojtkowiak |first=Maciej |title=Steam Locomotive PT 11 Constructed in Britain and used also in India |url=https://www.alamy.com/steam-locomotive-pt-11-constructed-in-britain-and-used-also-in-india-image5843192.html}}</ref>{{sfn|Hughes|1979|p=91}}

==Design==
[[File:BESA Standard 2-6-4 Type Tank Engine for Indian Railways.png|thumb|left|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 [[Indian locomotive class SP|SP]] and [[Indian locomotive class SG|SG]] class locomotives.<ref name=BESA3>{{cite book |author= |date=1909 |title=Indian Industries and Power, Volume 7 |url=https://books.google.com/books?id=cJQ7AQAAMAAJ&pg=PA275 |location= |publisher= |page=275 |isbn= |access-date=17 July 2024 }}</ref> 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.<ref name=BESA2>{{cite book |author= |date=February 1907 |title=Second report of the Locomotive committee on standard locomotives for Indian railways. |url=https://babel.hathitrust.org/cgi/pt?id=osu.32435015707664&seq=17 |location= |publisher= |page=6 |isbn=|access-date=17 July 2024}}</ref> The PTS variant was fitted with a [[Wilhelm Schmidt (engineer)|Schmidt]] superheater - the ''S'' stands for ''superheated''.{{sfn|Hughes|1979|page=18}} In contrast to the design recommendations of the BESA report, the SIR locomotives were fitted with external [[Lentz valve gear|Lentz rotary valve gear]].{{sfn|Hughes|1979|p=70}}

==References==
{{reflist}}

== Bibliography ==
*{{cite book |last=Hughes |first=Hugh |author-link= |date=1979 |title=Steam locomotives in India, Part 3 – Broad Gauge |url=https://archive.org/details/steamlocomotives0000hugh/mode/2up |location=Harrow, Middlesex |publisher=The Continental Railway Circle |page= |isbn=978-0-9503469-4-6|url-access=registration}}

== External links ==
{{Commonscat|Indian locomotive class PT}}

* {{cite web|title=Steam Locomotive PT 11 Constructed in Britain and used also in India|periodical=Alamy|publisher=|url=https://www.alamy.com/steam-locomotive-pt-11-constructed-in-britain-and-used-also-in-india-image5843192.html|url-status=|format=|access-date=2020-08-30|archive-url=|archive-date=|last=Maciej Wojtkowiak|date=|year=|language=en|pages=|quote=}} Preserved PT class locomotive number 11 in the [[National Rail Museum, New Delhi|National Rail Museum of India]], [[New Delhi]]

{{Broad gauge locomotives of India |state=collapsed}}

[[Category:Steam locomotives of India]]
[[Category:5 ft 6 in gauge locomotives]]
[[Category:2-6-4T locomotives]]
[[Category:Robert Stephenson and Company locomotives]]
[[Category:Passenger locomotives]]
[[Category:1′C2′ n2t locomotives]]
[[Category:1′C2′ h2t locomotives]]
[[Category:Kitson locomotives]]
[[Category:Railway locomotives introduced in 1936]]

Indian locomotive class PT - Revision history

Mohit8811: new new entry with sources...