Welcome to the forums Rainer.
It's Scottish Central and available from this site as freeware for £4.50p Sterling to cover cost of shipping etc.. The route is UK finescale and requires a reasonably decent spec machine to get the best from it.
Thanks for the quick reply, Chris, and the welcome. I have two of the other routes this site offers, Yorkshire Coast Railway and Thames Mersey, and I'm enjoying them immensely. Several weeks ago I gave a few people on the forum a good laugh when I titled a question about the YCR as "Yorkshire Coast Railway Inquiry." Anyway, thanks to you I now have another great British route to go after.