A train where you are forced into bondage

Your trying out a new train the only problem is this train never stops moving when the passenger (you) get on and you are tightly tied up with no escape

Its runned by the owner and you are the only person on the train and have been given pills to keep you at your age, height and health forever and you can never die and are the only person to ever enter the train and will be for the rest of the trains existence