Indian locomotive class HP

{{Infobox locomotive

| name = BESA class HP

| bgcolor =

| color =

| image = File:HPS 24467.jpg

| alt =

| caption = HPS 24467 on display at the National Rail Museum, New Delhi.

| powertype = Steam

| designer = British Engineering Standards Association

| builder = Vulcan Foundry
North British Locomotive Co.
Robert Stephenson & Co.
Kitson & Co.
William Beardmore & Co.

| ordernumber =

| serialnumber =

| buildmodel =

| builddate = 1906–1950

| totalproduction =

| rebuilder =

| rebuilddate =

| numberrebuilt =

| website =

| whytetype = {{whyte|4-6-0}}

| uicclass = 2{{prime}}C n2

| DRGtype =

| driver =

| gauge = {{track gauge|1676mm}}

| leadingdiameter = {{convert|3|ft|7|in|mm|0|abbr=on}}

| driverdiameter = {{convert|74|in|mm|0|abbr=on}}

| trailingdiameter =

| tenderdiameter =

| carrydiameter =

| minimumcurve =

| wheelbase =

| engine total =

| leading = {{convert|7|ft|0|in|mm|0|abbr=on}}

| coupled = {{convert|6|ft|9|in|mm|0|abbr=on}}

| trailing =

| tender total =

| tenderbogie =

| wheelbasewithtender = Variant with 3000 gallon tender: 50 ft 7 1 ⁄ 2  in (15,430 mm)

| wheelspacing =

| length =

| over couplers =

| over buffers = Variant with 3000 gallon tender: 60 ft 9 3 ⁄ 4  in (18,535 mm)

| width = {{convert|9|ft|6|in|mm|0|abbr=on}}

| height = {{convert|13|ft|6|in|mm|0|abbr=on}}

| frametype =

| axleload = {{convert|16.8|LT}}

| leadingbogie/pony=

| coupled all =

| coupled 1 =

| coupled 2 =

| coupled 3 =

| tenderbogieload =

| tenderaxle =

| weightondrivers =

| emptyweight =

| serviceweight = with 3000 gallon tender: 107 t
with 4000 gallon tender: 113 t
with 4500 gallon tender: 126 t

| locotenderweight =

| tendertype =

| fueltype =

| fuelcap =

| watercap = {{convert|3000|or|4000|or|4500|impgal}}

| tendercap =

| sandcap =

| fireboxtype = Belpaire

| firearea = {{convert|32|sqft|m2|abbr=on}}

| boiler =

| boilertype =

| pitch =

| diameterinside =

| lengthinside =

| smalltubediameter=

| largetubediameter=

| boilerpressure = {{convert|180|psi|bar kgf/cm2|sigfig=3|abbr=on}}

| safetyvalvetype =

| feedwaterheater =

| totalsurface = {{convert|2037|sqft|m2|abbr=on}}

| tubearea = {{convert|1880|sqft|m2|abbr=on}}

| archarea =

| fluearea =

| tubesandflues =

| fireboxarea =

| superheatertype =

| superheaterarea =

| cylindercount = Two, outside

| cylindersize = {{convert|20|x|26|in|mm|0|abbr=on}}

| cylinderpressure =

| valvegear = Walschaerts

| valvetype = Slide (HP class)
Piston (HPS/HPC class)

| valvetravel =

| valvelap =

| valvelead =

| trainheating =

| locobrakes =

| locobrakeforce =

| trainbrakes =

| safety =

| coupling =

| maxspeed =

| indicatedpower =

| poweroutput =

| tractiveeffort = Starting:

• 11.2 bar boiler pressure: {{convert|101|kN|lbf|abbr=on}}
• 9.3 bar boiler pressure: {{convert|84|kN|lbf|abbr=on}}

| factorofadhesion =

| operator = {{ubl|East Indian Railway Company|North Western Railway|Eastern Bengal Railway|Great Indian Peninsula Railway}}

| operatorclass =

| powerclass =

| numinclass =

| fleetnumbers =

| officialname =

| nicknames =

| axleloadclass =

| locale = British Raj (until 1947)
India (from 1947)
Pakistan (from 1947)
Bangladesh (from 1971)

| deliverydate =

| firstrundate =

| lastrundate =

| retiredate = 1980s-early 1990s

| withdrawndate =

| preservedunits = 2 (India)
1 (Bangladesh)

| restoredate =

| scrapdate =

| currentowner =

| disposition = Three preserved, remainder scrapped

| notes =

}}

The Class HP (Heavy Passenger) was a {{whyte|4-6-0}} broad gauge passenger steam locomotive introduced in 1906 on the railways of British India. It was one of the BESA locomotives developed by the British Engineering Standards Committee, later called the British Engineering Standards Association (BESA).