Need help on FF7 for PS1.. you know where you need to stop the train crashing into Corel and get the huge materia... du you have to press up down triangle x or how do you slow it down?

You can't slow the train down at all. Just fighty your way through as fast as you possibly can. It's not really that hard to be honest.

It was Up+Triangle, Down+X, Down+X. or something like that iirc.

Just mash the buttons with the palm of your hand.