chris,
lackawanna never had E7 engines, only E8's. but these williams shells can be used for E7 or E8, and I am not going to hold my breath for MTH to reissue a set in correct road #'s in their premier line for 2 rail.
joe,
do you do these conversion for other people, as I would want to keep the williams motors and drive. If I did decide to do this conversion, $150 for the AA set, another $100 for the power kit, $5 to strip the paint from the shell, $10 for 2 cans of paint, 4 couplers $15. I would have about $300 invested so far, how much would it cost to change the wheelsets. this still looks to be cheaper than $700-800 for a E8 set from mth.