Steve a diesel N and W switcher would probably do well as would something other than a J or large steam… lots of A, Y3, and Y6B. MTH did an 0-6-2 a few years ago.
Too late now but something to remember. And if an A is being done, why no 6 car sets of N and W hoppers?
We have enough “giant” engines…. Of course we ordered an A from you. N and W was not all big stuff.
A Lionel N and W aux tender would probably also do well. We need 2-3.
Thanks