Before getting this achievement, I found myself having lots of trouble trying to make it actually work, until I found out it only worked on a certain level of the game.
So naturally, I've tried each one I could until I found the right one which I'm going to show in this guide.

Anyway, let's start it!

1. First, you can go on the rails easily by using the platform in the middle of the level
   
   
2. Then, just go on the rails and wait for that train to give you a big old hug :)
   
   
3. And then you should have the achievement! (While also dying in the process, because this train is hella big)

If you don't like to read, or if you've had trouble following the instructions of the text tutorial with images, here's a video version: