Great Northern P-1

{{short description|Class of 15 American 4-8-2 locomotives}}

{{Infobox locomotive

| name = Great Northern P-1 class

| image = File:Railway Age Great Northern Mountain Locomotive 1914.jpg

| alt =

| caption = Chart from Railway Age Gazette Volume 57 (23) pp 1047-1050 showing Mountain type locomotive 1755

| powertype = Steam

| designer =

| builder = Lima Locomotive Works

| ordernumber =

| serialnumber = 1364-1378

| buildmodel =

| builddate = May-June 1914

| totalproduction = 15

| rebuilder =

| rebuilddate = June-November 1928

| numberrebuilt = 15

| website =

| whytetype = 4-8-2

| uicclass = 2′D2′ h1

| driver =

| gauge = {{track gauge|ussg|allk=on}}

| leadingdiameter = {{convert|36.5|in|mm|0|abbr=on}}

| driverdiameter = {{convert|63|in|mm|0|abbr=on}}

| trailingdiameter = {{convert|42.5|in|mm|0|abbr=on}}

| tenderdiameter =

| minimumcurve =

| wheelbase = {{convert|71.33|ft|mm|0|abbr=on}}

| engine total =

| leading =

| drivers =

| coupled =

| trailing =

| tender total =

| tendertruck =

| tenderbogie =

| pivotcentres =

| wheelspacing =

| length =

| over couplers =

| over bufferbeams =

| width =

| height =

| frametype =

| axleload = {{convert|55000|lb|kg t|abbr=in|sp=us}}

| 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 = {{convert|218000|lb|kg t|abbr=in|sp=us}}

| locoweight = {{convert|236000|lb|kg t|abbr=in|sp=us}}

| tenderweight = {{convert|161000|lb|kg t|abbr=in|sp=us}}

| locotenderweight = {{convert|487000|lb|kg t|abbr=in|sp=us}}

| tendertype =

| fueltype = Nos. 1750-1759: Coal
Nos. 1760-1764: Fuel oil

| fuelcap = {{convert|15|ST|t LT|1|abbr=on}}

| watercap = {{convert|8000|usgal|abbr=on}}

| tendercap =

| sandcap =

| fireboxtype =

| firearea = {{convert|78|sqft|m2|abbr=on}}

| boiler = {{convert|95|in|mm|0|abbr=on}}

| boilertype =

| pitch =

| diameterinside =

| lengthinside =

| smalltubediameter =

| largetubediameter =

| boilerpressure = {{convert|180|lbf/in2|MPa|2|abbr=on}}

| safetyvalvetype =

| feedwaterheater =

| totalsurface =

| tubearea =

| archarea =

| fluearea =

| tubesandflues =

| fireboxarea = {{convert|340|sqft|m2|abbr=on}}

| superheatertype =

| superheaterarea =

| cylindercount = Two

| cylindersize = {{convert|28|x|32|in|mm|0|abbr=on}}

| frontcylindersize =

| rearcylindersize =

| hpcylindersize =

| lpcylindersize =

| valvegear = Walschaert

| valvetype =

| valvetravel =

| valvelap =

| valvelead =

| transmission =

| trainheating =

| locobrakes =

| locobrakeforce =

| trainbrakes =

| safety =

| coupling =

| maxspeed =

| poweroutput =

| tractiveeffort = {{convert|60928|lbf|kN|2|abbr=on}}

| factorofadhesion = 3.58

| operator = Great Northern

| operatorclass = P-1

| powerclass =

| numinclass =

| fleetnumbers = 1750–1764 (P-1) 2175-2189 (Q-2)

| officialname =

| nicknames =

| axleloadclass =

| locale =

| deliverydate =

| firstrundate =

| lastrundate =

| retiredate = 1928 (1953-1958 as Q-2s)

| preservedunits = 0

| restoredate =

| scrapdate =

| currentowner =

| disposition = All rebuilt to Q-2 Class 2-10-2s in 1928 and scrapped by last retirement

| notes =

}}

The Great Northern P-1 was a class of 15 4-8-2 "Mountain" type steam locomotives built by the Lima Locomotive Works in 1914 and operated by the Great Northern Railway.