A few years back I remember talking to a model railroader who does Norfolk Southern (Modern) and was telling me there was a shop back in the NS territory that did the RP-ED4 road slugs? I am just getting back into the project in general (many different roads SP/UP/WP of the old days) but also a number of eastern roads. Would anyone happen to know of a person or shop that might have this unit and it's mother as well?