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Castings for the railings would indicate a GP or SD 7. So, 6 axles vs.4 will clear that up. If it was an EMD with twin stacks, then there was no turbo. (GP/SD 7's were normally aspirated). <br />Of course, there is no absolute answer, as the shops could have cobbled-up a unit from various donor units too. If you are interested in learning more on this type of stuff, I'd reccommend getting a copy of the "Second Diesel Spotters Guide" from Kalmbach. Come to think of it, I'd reccommend that I get a copy too, as my old trusty one is starting to fall apart from almost constant use. <br /> As far as what the loud bang was, if this WAS a normally aspirated EMD, my guess would be a crankcase explosion. This happens from time to time on older, poorly maintained units. Usually though, when that happens, the unit is disabled because it will blow the side covers off the block. I recall, in the 1970,s seeing an old C&O GP-9, mid-consist, running (barely) after just such an event. There was THICK, BLACK, oily smoke EVERYWHERE! See, what happens, is the engine looses its supply of pressurized intake air. ( the EMD non-turbo units use a Roots type blower to force air into the cylinders. When you loose a side cover, you loose intake pressure. This results in an overly rich condition in the cylinders. This will sometimes be accompanied by flames coming out of the stacks. Anyway, it's a sight to see. <br /> Hope this helps. <br /> Todd C.
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