This is what I wound up with on my temporary experimental layout. Instead of the rigid brass contact wire, I mentioned in a past post, in this thread, I opted for twisted copper grounding wire. I stretched the wire between two fixed points, 5" above the rail head. This works well for GG1s and EP5s. I used 3/8" diameter bolt rod for the masts. 1/8" x 1/2" horizontal members of aluminum. 1/16" diameter brass rod for the catenary wire.
https://youtu.be/_WUP71cmjkM
https://youtu.be/Jk8NN1yikTo