How to pass the big smoke mission with the train?

In the "Big Smoke" mission in Grand Theft Auto: San Andreas, you need to help Big Smoke escape from the police by driving a train. First, ensure you have a vehicle parked near the train tracks. When the train arrives, jump onto it, and use the controls to steer, avoiding any obstacles while keeping an eye on the police. Your goal is to successfully navigate the train to the destination without crashing or getting caught by the authorities.