A puzzling piece from 2002 about Darius McCollum, a man who is obsessed with the New York subway. McCollum knows every rule and procedure, every timetabled train, every station; problematically, though, his obsession also extends to lengthy spells impersonating workers on the train system, with stolen uniforms and forged permission letters. He does the job properly and to a high standard, but nevertheless is routinely arrested and has spent the better part of twenty years in jail for his crimes. The MTA, who run the subway, are reluctant to employ him for liability reasons – even though he’d likely be the best employee they have. Intriguing and dismaying.