I don't think you caused that derailment, it happened by itself. Forgive me for laughing out loud, it was just so funny the way the whole train tumbled off the track. Railway disasters aside, the Mk. 1 coaches have corridors down the middle, some Mk. 1s have compartments and the corridor is to one side. Take a Chocolate & Cream Mk. 1 Brake Coach for instance. The corridor is on one side, with passenger seat compartments on the other, with sliding doors. Directly behind the last compartment is the Guard's Compartment, where the Guard will sit and take notes in a log book. Beyond that is the space for wheelchairs and less able passengers who are on crutches or something. It's also used for baby prams and pushchairs. The Mk. 1s have connecting doors at both ends, so they can be connected to other Mk. 1s to make up a passenger train. Thus this gives them the name of Mk. 1 Corridor Coaches. They also have built-in toilets for passengers, so they don't always have to wait till the train stops at a station.
