Catenary: I have system I designed prior to obtaining my 3D printer (B3D). It's similar to the one that OGR Ad Man has on his layout. I combine elements of several systems; Marklin wire with Pittman catenary Erect-a-Wire poles
With the additional Vision GG1s I will have a dozen engines that have pantographs so i will be going from design to build. However, the catenary will be higher that the extension of the pantographs to avoid damaging either and not to strain my IMAGINATION!