'Sometimes you hear people say "Oh I had a nightmare journey on the tube" and you understand that their commute home on the London Underground was more unpleasant than usual. We don't take the word 'nightmare' to mean that in the middle of a packed carriage they literally realised that they were wearing their pyjamas and then felt their teeth crumbling as their childhood maths teacher stood before them pointing and laughing, only it wasn't exactly the Tube because it was also the kitchen.'

A Tube train is stuck underground because the economy above has collapsed. How has this happened and how will the passengers get out? Will they have to break the rules of Underground etiquette and actually speak to each other? In John O'Farrell's caustically funny short story, nothing is certain.

The city is filled with stories. In twelve books, twelve writers tell their tales of London life, each inspired by a different Underground line. Some are personal, some are polemical; every one is unique.

John O'Farrell, author of The Man Who Forgot His Wife, An Utterly Impartial History of Britain and Things Can Only Get Better, turns his comedic genius to the problem of capitalism, encapsulated in a Tube train full of passengers stuck underground – part of a series of twelve books tied to the twelve lines of the London Underground, as TfL celebrates 150 years of the Tube with Penguin.