Large Scale Central

3 rail O scale track conversion to 2 rail with outside 3 rd rail

Hi there:

Yes I know this is G World.

What happened to scale 2 rail track AC with the outside 3rd rail?

Any info on how to set up O scale 2 rail track with the outside 3rd rail?

Has marklin ever produced an O Scale version of their HO track with the almost invisible center 3rd rail?

Thank you

Norman