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A question for those of you that have multiple MTH 6 axle Premier diesels.  Is the frame size and truck spacing the same across multiple types of locomotives?  For example is the SD60/70 frame length the same as the U30C/C30-7 frames?

The reason I ask is that I have one of the now defunct Big Dawg Originals scale E60 shells that are designed to go an a SD60 chassis.  I've owned this forever, but finally thinking of doing the project.

If the GE frames are the same length I'd rather find a good GE runner as the donor so the trucks are little closer to the prototype.  I realize I can swap side frames, but I have other engineering challenges to figure out.  

Looking for any and all input.  Thank you!BDO Shell

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Jonathan, that shell is specifically designed to go on an MTH SD60 frame because when we developed it that what we had available. I assumed MTH SD60, SD40 and GE frames are nearly all the same for similar length locomotives. While in real life the E60CP/E60CH/E60MA was 71ft 3”, this model works out to be 1 inch or 4ft shorter, so it would fit on commonly available frames. 

I once heard the E60s reused Alco C630 frames. 

Like you, Its on my quarantine project list now. The roadblocks I have hit is 1) Where to get pantographs and 2) MTH parts are not so easy to come by, even before this covid mess.

Now if a certain manufacturer were to do a run of these to pull their upcoming amfleet cara ::cough::scott mann::cough::cough you can put me down for buying 5! 

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