Years ago I came across photos of Ivor Walsh's HO traction layout in the old Traction & Models magazine. Eventually I even acquired some of his HO TTC PCC cars. I found out today the layout still exists and a film has been created about it. Unfortunately, the layout was attached to the walls of the basement and will probably be destroyed when the house is sold. Below is a trailer for the documentary.
http://tinytracksdoc.com/