Thanks guys, great input. I have the Williams Genesis pair, great runners for open house situations, but of course I have to set a loop on traditional running. Yah, the Williams units are a little short, and a bit lacking in detail by modern standards.
An MTH unit may be the way to go; I'm just a bit reluctant to buy a loco simply to convert it, but I'll watch for one. Thanks again for the help... This site collectively knows everything!
Jan