How can I move a model and the players on top/inside of it?

Hi! I've been really curious of games like Lumber Tycoon 2 (the ferry) and Innovation Inc Arctic Base (train) and how they move the models and the players on top of them. I have tried tweening the model using several methods, and it moved the model, but the player on top just stays put in the same position, not moving with the model.

I would like to achieve it with some accuracy, not just a wheel on a track with messy values like speed, throttle, etc.

Thanks in advance!

Recently, EgoMoose made a DevForum post about a "Wall Stick Controller." This allows players to be stuck to things, and even stay on it if it is upside down. The place is uncopylocked, so you can dissect the scripts from it and use it in your own game.