Thanks to everyone for their thoughtful suggestions. For a temporary fix so I can run the polar express for Christmas I will try the CA glue on the track joint and rely on tthe pvc pipe
running the bigger locos requires a different solution
the idea of a suspension bridge is enticing but the dynamic load probably rules that out.
will have to be some type of vertical support, maybe small diameter brass allthread through drilled holes on either edges of the fastrack (where the painted railroad ties end) with a small nut below as a support?
Thanks again for all your suggestions and I will definitely keep you posted on my solution!
enjoy the season and happy new year!
BK