Once you write down your answer, the compartment door slides open. When you walk through, you find yourself in not an ordinary compartment, but the driver's compartment. The train speeds dangerously fast with no driver but you.

If you look out the window, far ahead in your view lies mangled and broken train tracks leading to a ragged cliff that you will take a tumble down if the train doesn't stop. How far is the drop? 100 feet? 600 feet? Too many to risk, surely. Better put your Charms thinking caps on, and fast.