1. Download both bugfix tiles.
-> https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1380036350
-> https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1380037575

2. In world-builder mode, open the world in which the city with the missing rails is placed.

3. Place both bug fix tiles in the same world and save the World.

4. Now the rails and houses should be back.

(If the rails are still not there :)
5. Create a new world in which the city and the two bugfix tiles are.

6. Now the rails and houses should be back.

If you still have problems with the tile join my Discord server:
https://discord.gg/E3yvnW3