Thank you, this is just what I was looking for. What I have is an older Bemo starter set with a Ge 4/4 II with 4 coaches plus a Panoramawagon and a few other wagons. I am estimating that I need at least 2 1/2" tunnel clearance. And I will use the longer wagons to check side clearances. Catenery is something I have never modeled other then helping a friend build a Marklin layout and his catenary was easy to install.
Thanks again,