These videos may help:
GTA V Online - How to enter / steal the Train Cab / Engine on ALL 5 Systems, AFTER the Update!
How to Hijack the Train on GTA V! | Tutorial
GTA V - HOW TO "HIJACK" A TRAIN LIKE A BOSS!
GTA V: Train Hijacking
Thank you for willing to help answering this question!
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The thing is, that you can't stop or drive a train without mods. There is no other way, so you need a PC version of a game and a modification called "Engineer Railway". You will also need a Script Hook and ASI Loader for this mod to work.
There is only one place and time, where you can officially drive a train - it is a single player mission with Trevor, called Derailed. It is a very fun part, where at first place you need to get on the train riding a bike, hijack it and at the end there is a massive crash.