EMD SD40T-2

{{One source|date=October 2022}}

{{Infobox locomotive

| name = EMD SD40T-2

| powertype = Diesel-electric

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

| image = SP 8238 CA Caliente.jpg

| caption = SP 8238 eastbound at Caliente, California, in the late 1980s

| aarwheels = C-C

| buildmodel = SD40T-2

| builder = General Motors Electro-Motive Division

| cylindercount = 16

| primemover = EMD 16-645E3

| enginetype = V16 diesel

| poweroutput = {{Convert|3000|hp|abbr=on|lk=in|sigfig=3}}

| tractiveeffort = {{Convert|92000|lbf|kN|abbr=on|lk=on}} (starting)
{{Convert|82000|lbf|kN|abbr=on|lk=on}} (continuous)

| fuelcap = {{Convert|4400|usgal|abbr=on|sigfig=3}}

| length = {{Convert|70|ft|8|in|abbr=on}}

| height = {{Convert|15|ft|7.5|in|abbr=in}}

| width = {{Convert|10|ft|3|in|abbr=on}}

| locoweight = {{Convert|368000|lbs|kg|abbr=on}}

| totalproduction = 312

| builddate = June 1974 – July 1980

| nicknames = "tunnel motors"

| operator = Southern Pacific (and Cotton Belt), Rio Grande, Union Pacific

| disposition = most still in service as of 2010

| locale = United States

}}

The SD40T-2 is a model of diesel-electric locomotive built by General Motors Electro-Motive Division in the United States. The SD40T-2 is equipped with a 16-cylinder EMD 645E3 diesel engine producing {{Convert|3000|hp|lk=in|sigfig=3}}. 312 SD40T-2s were built for three railroads in the United States between April 1974 and July 1980. This locomotive and the SD45T-2 are popularly called tunnel motors, but EMD's term is SD40-2 with "cooling system modifications" because they were designed for better engine cooling in mountainous areas.{{Cite web|url=http://trn.trains.com/railroads/abcs-of-railroading/2018/01/tunnel-motors-from-the-past|title=Tunnel (motors) from the past {{!}} Trains Magazine|date=January 1, 2018|first=Chris|last=Guss|website=TrainsMag.com|access-date=2019-02-13}} The difference between this locomotive and its non-tunnel motor cousin, the SD40-2, are the radiator air intakes are located lower down at the rear of the locomotive. File:EMD SD45T-2 vs SD40T-2 radiator fan motor access doors.jpg

This locomotive model was purchased by the Denver and Rio Grande Western Railroad, the Southern Pacific Railroad, and its subsidiary Cotton Belt. Southern Pacific's version has a {{Convert|4400|usgal|L impgal|adj=on|sigfig=3}} fuel tank and is {{Convert|70|ft|8|in}} long. Rio Grande's version has a smaller {{Convert|4000|usgal|adj=on|sigfig=3}} fuel tank.