I probably should have researched more than I did. With not too much work I could have indeed swapped out the wheel sets. At that time, unfortunately, I had not been corresponding with OO Forums. Brother, I sure am now!
I am relieved to hear that Triang did not go into 3 rail,some of those vintage piecesare really interesting.
What has come back from my inquiries is that Hornby made a 3 rail, but it utilized DC to create a strong communication of electricity through the car bodies back to the locomotives to overcome the eternal bane of model railroaders: dirty track and oxide.
In seeing some examples of that 3 rail Hornby range, it is
really beautiful stuff. Were that I had unlimited funds I would
become a mad collector of it. Colorful, rugged, with its own
proportion. Quintessentially British.
As to the conversation of dirty track, I found my solution in an
obscure article by the noted UK professional modeler and author, Lionel Strang. He recommends this stuff. I thought he was bonkers, until, in desperation, I tried it. Now I swear by it: