The line is just short of 30 km (~18 miles) long, it is a fictional map called "Polskie Koleje Wąskotorowe". The map was created to show a typical Polish NG line, the lenght is roughly average as well. The longest real heritage NG line in Poland as an active track 49km long (~30 miles), most are shorter. For example the NG line that is nearest to me is roughly 15 km long (a bit over 9 miles) of active track.
The original was designed by the user Jamal and that is available from http://www.trainz.pl/ He desrves most of the credit.
What I am running is my own modified version that (aside from some more minor changes) uses new foliage, roads trees and environment settings to make it fully seasonal.
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Note: The forest you see in the top part of the image is pretty much all coniferous, so it is evergreen by design
80 miles in this game is quite a feat for the designer.
its a nice size for a route, and i love this shot, very atmospheric.
Yes 80 miles is hard work , especially as much of it is high mountains with very specific cliff types which don't look right if you just use textures , a lot of the rock patterns runs parallel to the ground and if it changes direction a texture often won't follow the right path. it also looks very repetitious, but the same is true with splines, so I've got hundreds of different ones and i still have issues with getting it to look like the original. Also no one has actually made a lot of the vegetation in the area so i have to use whats available and make the best of it, JVC was going to do some prototypical stuff but he seems to have retired for the moment :-( .