The last version I downloaded before the site was closed down was; Razorback Railways v6.5 (38 megs)...
On backup, I've got RBRDual_Rolling Stock_1.cdp (55megs) & 2.cdp (63megs). Also RBRDualMap_Assets_1.cdp (39megs) & 2.cdp (36megs). Can't seem to find the map itself, unless it is already in on of the two RBRDual Map_Assets cdp's...
Good to see you have posted on their "shoutbox"
Good luck.
Cheers, Mac...