The title does exactly what it says on the tin, taking advantage of MTA's signalling installations on the 1 through 6 lines (and the 42nd Street Shuttle) to determine trainarrival times down to the minute.
The traveler stumbles bleary-eyed into the crowded arrival hall, only to face another two- to four-hour journey either by bus or train (a taxi ride would bankrupt an Arab prince) into the city.