Ed,
Thanks for all the research and insight on the Hellgate bridge; it was a great article, I enjoyed it.
You and Rich came up with a pretty easy fix for the 305; but I have an alternate solution for Lionel.
Why not design a Fastrack option that would be at home on the Hellgate bridge as well as any number of trestles. Fastrack is a great product; but I do not care for the way it looks on a trestle or a bridge. I'm sure that they could figure out a way to keep the roadbed; but lose the simulated ballast for bridge and trestle applications.