Pulling Out (from) All the Stops - Visiting all of NY's subway stops in record time

With 468 stops served by 26 lines, the New York subway system can make visitors
feel lucky when they successfully negotiate one planned trip in a day. Yet
these two New Yorkers, Chris Solarz and Matt Ferrisi, took on the task of
breaking a world record by visiting every stop in the system in less than 24 hours.
They used mathematics, especially graph theory, to narrow down the possible
routes to a manageable number and subdivided the problem to find the best
routes in smaller groups of stations. Then they paired their mathematical work
with practice runs and crucial observations (the next-to-last car stops closest to
the stairs) to shatter the world record by more than two hours!