While its certainly possible to make fictional routes, many users prefer to re-create a real route from somewhere in the world to operate.
With these routes it is particularly important that signal placement, speed limits, and distances are all set correctly to allow an accurate timetable to operate.
Some possible resources are suggested below for these purposes.
Worldwide Track Layouts
Spain
Sweden
United Kingdom
Track Layout & Signal Placement
Speed Limits and Distances
- Network Rail Sectional Appendix - No need to subscribe, just scroll down and they are all available at the bottom of the page