Q Car Company makes third rail chairs IRT type and IND BMT type. They are white metal and are for using HO rail. He also makes trucks for many subway cars along with third rails shoes and shoe beams. They are dummy's but can be converted for operation. The trolley poles are functional. All his motors are 12 volt DC and he can provide two rail insulated or straight DC using outside third rail and or overhead wire operation. Steve Olsen operates his cars using outside Third rail as does the Bay Ridge Model Railroad Club. Joe Frank, Bob Olson and I operate using Two rail with a dummy outside third rail. I have run 2 rail scale trucks on Gargrave track without issue. Mostly in a subway environment where the tracks are not readily visible. Gargrave made 2 rail track for many years with outside third rail mounted on longer ties every 4 or 5 ties. They also made chairs. They may still would produce the track if asked to. The chairs could be made quite easily. If you are serious give them a call.
Happy New Year to all.
Nate
