The Inertia of Your Carriage

I find the inertia of trains quite fascinating. That's why they can't climb over hills, because if you started a train, gone really, really quickly,. You know where redding is? Far away from London, that is. And it was gone full-pelled. If you ever see the cross-section of a wheel touching a train rail, I know we've gone off the rails literally with this. It would crash through the barriers at Paddington. That's how much inertia a train has. So how do you stop it? How do you go forwards or backwards? Where's the excitement in that? It's about timing. It's about using the inertia of your carriage