Thanks for reminding me of Shamus' tutorial, Robin. I just now took another look at it.
I thought about that, Catt!, doing one of each... The bridge in the front crosses one track, but the one in the back crosses two. That might make the rear one a better candidate for the steel trestle, but I think a wooden one would look better...
I suppose the holdup, Errol, is time and building materials. I can make the time (and probably will here very soon), but I gotta get ahold of some appropriate building materials. Maybe I can arrange a trip to the hobby store later this week...
But my first priority is to power up the top level!
-Rory