We will figure this out. Bob Stevenson has a preliminary guess at $270 per locomotive, based on new molds. But the molds themselves will be expensive; it will take 1/2 gallon of liquid rubber,and that stuff is $230 per gallon!
I am trying to get my hands on a Legacy part. I will know more on that early next week - or if you have a connection with Mike, see if he could send a casting? If they modified it, perhaps we could modify it back?
Let me get a few photos posted - one idea is to use Wolfer truck sides and the Lionel tongue and bolster. For that, all I would need is a "bowed, but not crumbling" casting.