Boy playing with his train set

A boy is playing with his train and his mum overhears him saying, "All you bastards getting off, for god's sake hurry up, all you bastards getting on, for christ's sake hurry up and sit down".

At hearing this, his mum sends him to bed for two hours to learn how to play nicely.

When he carries on playing after the two hours his mum listens in again and hears him say, "Those disembarking have a nice day and mind the step, those boarding enjoy your journey, and those upset at the two hour delay, blame the fat bitch in the kitchen."