This is just one more time I wish I could get the photos to come up on the forum. I bought a couple packs of the code 100 "easy track" straight sections. Measured the length of each engine and tender, put two of the track sections together, cut to length to allow about a half inch in front of and behind the engine and tender. Using a sheet of the paper backed 3/16" foam board, cut out a platform for the track section to sit on, just a little bit longer and a little wider than the section of track. Now cut another platform just a little longer and wider than the first. Cover each platform with green felt, wrap edges and ends over and superglue underneath. Glue smaller platform to top of larger platform, center, line up and glue track section on top. You now have a stable, felt covered, stepped base for each engine/tender to sit on. I also made up a bumper for each end, maybe a little taller than the couplers, painted flat black and glued to the end of the track and the base so that nothing can roll off either end.
All my engines are displayed on shelves, sometimes carefully dusted with a make-up brush. Engines are carried to and from the temporary oval on their display bases and engine to tender wiring is never disconnected. Engine and tenders are lifted as one unit, kept mostly horizontal and placed on track. Get good enough at it so that draw bar is still connected also. I feel that these connections should not be taken apart except for kitbashing or a change to another tender-------------John