we make a high rail dummy coupler out of jeweler's pewter(no zinc rot) that should fix the problem that you and many others have ... check this out
http://www.scalecitydesigns.co...-Walthers_p_267.htmlhttp://www.scalecitydesigns.co...-Walthers_p_267.html
we also make a dummy scale sized coupler http://www.scalecitydesigns.co...eight-Car_p_255.html