I've read go things about the Wiliams ten-wheeler and wondered what would be reasonably appropriate passenger cars or rolling stock to run with it. From what I could find on Wikipedia, it looks like this was principally a 19th century engine. I have no modern era engines or rolling stock, but also don't have any 19th century stuff except a General Set.
I'm not trying to be perfectly prototypical, but I do want maintain some sense of realism. Would a set of O27 Madison cars work? What about the rolling stock that NYC version comes with in Williams' Lakeshore set? Is that really appropriate?