Tunnel Motors

[KBCpresident]

 What's the difference between an SD40T-2 and a 45T-2?

 

How about the difference between an SD40 and a 40-2

 

Thanks.

[CSSHEGEWISCH]

As built, an SD40-T2 has a V-16 645 engine at 3000 HP and an SD45-T2 has a V-20 645 engine at 3600 HP.  The SD45-T2 is also a few feet longer.

[SSW9389]

We have to get technical here and say that the carbody of the SD45T-2 was longer because the engine block was longer. The frame length on both the SD40T-2 and SD45T-2 was identical. Other differences would be that the Cotton Belt/Southern Pacific tunnel motors used a larger fuel tank than the Rio Grande units did. Then you have Southern Pacific SD40T-2s with snoots of two different lengths. The very first order of Espee snoots used the 116" nose and the later Cotton Belt/Espee snoots used the 123" nose.

There were a total of 559 Tunnel Motors built. The breakdown is as follows: Southern Pacific 163 SD45T-2, Cotton Belt 84 SD45T-2; Southern Pacific 229 SD40T-2, Cotton Belt 10 SD40T-2, and Rio Grande 73 SD40T-2.

CSSHEGEWISCH

As built, an SD40-T2 has a V-16 645 engine at 3000 HP and an SD45-T2 has a V-20 645 engine at 3600 HP.  The SD45-T2 is also a few feet longer.

[carnej1]

The primary technical difference between an SD40 and an SD40-2 is that the later, like all dash 2 EMDs, used an improved modular electrical system.

[KBCpresident]

 Any External differences?

 

[nssr9169]

There is a water sight glass under one of the radiator grids...i cant remember what side its on however

[timz]

KBCpresident

Any External differences?

Between an SD40 and SD40-2? Most of the latter have HT-C trucks, which no? SD40s do; that's the main distinction. The -2 is also three feet longer, so the porch at each end is a little bigger.

SD45T-2 vs SD40T-2: the 45 has three access doors in the side of the hood below the radiator, the 40 has two. A short-nose SD40T-2 will have a front porch that the SD45T-2 lacks; there were no long-nose SD45T-2s, so no problem identifying a long-nose SD40T-2.

[trainfan1221]

AS a side note, Conrail's SD40-2s did not have the HT-C truck.   If you see an SD40 and an SD40-2 next to each other you can see the difference in length.

[fredswain]

SSW9389

Then you have Southern Pacific SD40T-2s with snoots of two different lengths. The very first order of Espee snoots used the 116" nose and the later Cotton Belt/Espee snoots used the 123" nose.

Did any of them come with an 88" nose? UP is using an SD-40T-2 for local work between Lloyd Yard and Gulf States Toyota north of Houston. Was this nose original or did they change it to this at some point after they acquired it? I am actually building a 1.5" (1/8 scale) version of it right now and am going to use the 88" nose for reference. I always throught the longer noses were a bit goofy looking. I have a bunch of photos I took of it one day from all sorts of angles for modelling reference. If anyone is interested in seeing them let me know and I'll post them.

[KBCpresident]

 If I have a model of a locomotive in the SD40 family, with a sightglass on one side under the radiator, is it a 40-2?

[SSW9389]

 Fred: All Espee shortnosed SD40T-2s used the 88" nose. The Rio Grande had both 81" and 88" noses on their SD40T-2s depending on when they were built. I know of no nose tranplants among these units. How was that for alliteration?

Ed

fredswain

SSW9389

Then you have Southern Pacific SD40T-2s with snoots of two different lengths. The very first order of Espee snoots used the 116" nose and the later Cotton Belt/Espee snoots used the 123" nose.

Did any of them come with an 88" nose? UP is using an SD-40T-2 for local work between Lloyd Yard and Gulf States Toyota north of Houston. Was this nose original or did they change it to this at some point after they acquired it? I am actually building a 1.5" (1/8 scale) version of it right now and am going to use the 88" nose for reference. I always throught the longer noses were a bit goofy looking. I have a bunch of photos I took of it one day from all sorts of angles for modelling reference. If anyone is interested in seeing them let me know and I'll post them.

[fredswain]

Ed that's good to know. Thanks. It'll take me quite some time to get this project done and then it'll come down to which paint job I want it to have. I'm thinking UP!