PNR 2500 class

{{Short description|Diesel-electric locomotives used by Philippine National Railways}}

{{use mdy dates|date=December 2021}}

{{Infobox locomotive

| name = PNR 2500 class

| powertype = Diesel-electric

| image = PNR train locomotive near Naga Station (Tabuco, Naga, Camarines Sur; 04-15-2023).jpg

| alt =

| imagesize = 300px

| caption = DEL 2540 in Naga, Camarines Sur. 2540 was the first unit wearing the Orange livery.

| hatnote =

| builder = GE Transportation

| ordernumber =

| serialnumber = 35674-35686
40742-40751
40901-40910
41838-41847

| buildmodel = GE U10B

| builddate = 1965 (2501-2513)
1976 (2514-2523, 2524-2533)
1979 (2534-2543)

| totalproduction = 43

| rebuilder =

| rebuilddate =

| numberrebuilt =

| whytetype =

| aarwheels = B-B

| uicclass = Bo-Bo

| gauge = {{track gauge|1067 mm|lk=on}}

| trucks =

| bogies =

| leadingdiameter =

| driverdiameter =

| wheeldiameter = {{convert|1000|mm|in|0|abbr=on|order=flip}}

| trailingdiameter =

| minimumcurve = 57 degrees

| wheelbase = {{convert|7|ft|2|in|m|abbr=on|order=flip}} per bogie

| length = {{convert|37|ft|m|abbr=on|order=flip}}

| width = {{convert|9|ft|m|abbr=on|order=flip}}

| height = {{convert|12|ft|m|abbr=on|order=flip}}

| frametype =

| axleload =

| weightondrivers =

| locoweight = {{convert|110,000|lb|t|abbr=on|order=flip}}

| tenderweight =

| locotenderweight =

| tendertype =

| fueltype = Fuel oil

| fuelcap =

| lubecap =

| coolantcap =

| watercap =

| tendercap =

| sandcap =

| consumption =

| watercons =

| electricsystem =

| collectionmethod =

| primemover = Caterpillar D398

| rpmrange =

| enginetype = Diesel engine

| aspiration =

| displacement =

| alternator = GE GMD-175

| generator = Main: GE-GT601
Auxiliary: GE GY27

| tractionmotors = 4 × GE 761

| cylindercount = 12

| cylindersize =

| frontcylindersize =

| rearcylindersize =

| hpcylindersize =

| lpcylindersize =

| valvegear =

| valvetype =

| valvetravel =

| valvelap =

| valvelead =

| transmission = Electrical

| gear ratio = 93:18

| multipleworking =

| maxspeed = {{convert|64|mph|km/h|abbr=on|order=flip}}

| poweroutput = {{convert|1050|hp|kW|abbr=on}}

| tractiveeffort =

| t/e starting = {{convert|23,300|lbf|kN|abbr=on|order=flip}} at 30%

| t/e continuous = {{convert|33,000|lbf|kN|abbr=on|order=flip}} at {{convert|30|mph|km/h|abbr=on|order=flip}}

| factorofadhesion =

| trainheating =

| locobrakes = Dynamic and air

| locobrakeforce =

| trainbrakes =

| safety =

| operator = Philippine National Railways

| operatorclass = 2500 class

| powerclass =

| numinclass = 43

| fleetnumbers = 2501–2543

| officialname =

| nicknames =

| axleloadclass =

| locale = Manila
Naga

| deliverydate = December 1965 (2501-2502)
January to March 1966 (2503-2513)
April 1976 (2514-2523)
May 1976 (2524-2533)
June 1979 (2534-2543)

| firstrundate = 1965

| lastrundate =

| retiredate =

| withdrawndate =

| preservedunits =

| restoredate =

| scrapdate =

| currentowner =

| disposition = 1 active, 2 inactive, 40 scrapped

| notes = {{cite web|last1=Craig|first1=Robert|title=GE U10B Specs|url=https://thedieselshop.us/Data%20GE%20U10B.HTML|access-date=8 June 2014}}

}}

The PNR 2500 class is a class of 43 GE U10B Diesel Electric Locomotives first introduced in 1965 with the delivery of the first 13 locomotives of the class.{{cite web|last1=Craig|first1=Robert|title=GE U10B Roster|url=https://thedieselshop.us/GE_U10B.HTML|access-date=8 June 2014}}{{Cite web|title=Philippine Train Enthusiasts and Railfans Club (PTERC) {{!}} GE U10B Road Switchers|url=https://www.facebook.com/groups/PTERCOfficial/posts/350331199413916/|access-date=2021-12-27|website=www.facebook.com|language=en}}{{User-generated source|date=December 2024}} The locomotives were previously used for long haul services in the PNR North Main Line and the PNR South Main Line.