Bob Allison
Mike,
It’s definitely MRJ200, under the heading “An express train for the main line ……”. I think posting a copy of the article here would be a breach of copyright so I won’t do that, but if you let me have contact details maybe I can help.
A thought: Chris P wanted to push long rakes of P4 carriages with sprung suspension through reverse curves, so the boxhead coupling is a moderately complex solution to a very challenging problem. I have used a very simple hook and bar system which achieves the same result for un-sprung stock in EM Gauge if you are interested. Only drawback is that splitting the rake requires one end of the carriage to be lifted off the track by 10mm or so.
Regards,
Bob