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Actually 4015, They Built the Challenger's, THen they built the Big Boy's. The Big Boy's worked so well, that they redesigned the Challengers. Then its the DM&IR 2-8-8-4s that look alot like the Big Boy's. This could be partly becasue these were constructed during WWII and the War Department had a cap on developing any new technology not geared toward the war effort. It would have been just a simple matter for Alco to take the now stock Big Boy deisgns, tweak them in a few places for the DM&IR and whala, instead of designing and developing a new locomotive from scratch. Its a locomotive derived from existing specifications. I think it would be an easy thing to model a DM&IR 2-8-8-4 from a Big Boy. The big thing would be changing it to a two wheel pilot truck, and shortening up the pliot. That would be pretty much the extent of the modifications. As for the other 2-8-8-4s they were made by Baldwin (Originally for the Northern Pacific) and thust have very little resemblence to a Big Boy. James
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