The 'Northern Line' is the correct exit route from 'Grand Central Station'. The two A-I tunnels lead from and to 'Grand Central Station'. 'Piccadilly Circus' is a loop in the 'Northern Line' The names 'Grand Central Station', 'Northern Line' and 'Piccadilly Circus' were vaguely inspired by the story 'A subway named Mobius' by A J Deutsch.

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