I completed the puzzle in the control room and the train is on the way. The lever has broken now and I can’t use this room to stop the train anymore. Russell is telling me to find a way to stop the train but I don’t know how to do it. How are you meant to stop a moving train?
Run outside of this room into the train yard and on the right side where the train tracks split, you will see a lever on the raised platform. Pull this lever and it will divert the train, stopping it…in a pretty crude way. Anyway, this is what you need to interact with to progress with the story.