This surge of new expansions for a more or less out of print game is interesting to me. Are there enough copies of the base game out there to support all these expansions?
Probably not. However, the rumor is that Railroad Tycoon may be republished as 'Rails of America' or USA or something like that. This is more-or-less to get around the licensed property item with Sid Meier's game. If that happens, then there should be an ample supply.
That said, there are plenty of RRT owners now that are loving the fact that expansions are coming out.