This is a idea....
Ok, check this out, "two train's runnin' and a trolley line"-Beck
The trolley line is up to you as well as the tunnel locations. I tried the trolley elevated, but it detracts from the tree and other lines. An 031 twice around and an 036 loop around. Having the trains run in opposite directions with a bump'n'reverse trolley sliding back and forth will look cool.
I can email you the SCARM file if you have it installed.