Hello Dave McB, unsure about route descriptions as such, if you are new to Trainz, then I recommend you search on the download station (DLS) under the category - layouts - and see what takes your fancy. Are you into long freight runs, or local passenger trains, or narrow guage, trams, or steam, diesel, etc, etc. What areas of the world are you interested in, Canada, U.S; Europe, Britain or Australia, there's hundreds to choose from......:hehe:
Give us some ideas and we'll come up with some more suggestions, but those already mentioned are very good, if you are into standard guage. For a great Canadian protoroute, try neilsmith749 (kuid 95512) Toronto Lakeshore West, and for industrial switching layouts, any by philskene (kuid 69871 ) are excellently created and run OK on low/medium sized computers, and all recommended for TRS2004.
Loads more ideas also to be found on 3rd Party sites from around the world, as some links already offered, give us your thoughts and we'll come to your rescue......
Cheerz. ex-railwayman.