How about something a little eccentric like the Harton colliery railway? On a more normal note Al to Voss( Bergenbanen).
Those are just names to me. You should add more to the suggestion cuz I simply do not know what they are. Look at other suggestions for inspiration that go into detail
Philosophically a curious reply. There are search engines. But I committed errors. Harton colliery railway should have been the Harton Electric Railway. Both the Harton Electric Railway and the Bergenbanen are on YouTube. Railcowgirl. Harton Electric Railway is a, mostly, closed system which may help Devs. It seems to me that railfans are of at least two types. Shunters and journey-ers. I hope that helps.
I would love to see the Fowler 3F Jinty made as an enhancement to Spirit of Steam.... 1. All those yards and sidings to shunt 2. Station pilot shunting duties. 3. Local pick-up goods services 4. Local passenger services 5. Works trains/ Permanent way trains The 3F would be a fantastic addition to TSW3.