I used 1 1/2" dowels as column support. A fun toy train approach using MTH Scale Tracks.
Below are photos of the wiring and the opposite loop;
This elevated feature was built to accommodate trolleys, RDCs and Galloping Geese.
For my own layout I used a pair of these cookie cutter modules with spring operated Ross turnouts and GG track for an elevated eye level 70' length fun run. I made a 4' X 8' LH and RH balloon with half of the loop in a mountain:
For support you can use wooden hanger rod cups mounted on the bottom of the sub roadbed plywood and top of platform. I drilled a hollow void through the center of the column for the wire feed. You can see by the cup pattern where the elevated line ran:
