It was taken down due to license issues, they did not obtain a license from the company that actually owned the line.
I posted about this awhile ago, you can find out why in some of the messages posted here: https://forums.dovetailgames.com/threads/bessemer-lake-erie-no-longer-for-sale-on-steam.18880/ But it is supposed to come back unbranded at a later date.
Read all about it here and a couple of posts from the developers of this route. http://railworksamerica.com/forum/viewtopic.php?f=6&t=21747
