For example this game: https://www.roblox.com/games/4780431380/The-Metro and https://www.roblox.com/games/4675149702/Vibe-Train
It has the lights and stuff that come by every so often to simulate movement. How do you achieve that?
First one looks like an object being moved past the window and then despawned and respawned at the beginning again. Maybe just a loop of CFrame?
Second one looks like there is a model split up into segments which are teleported and then moved past the train on repeat, similar to the first but more segments so the model can be well out of frame before its teleported
Idk, just a guess, good luck!