This year, they could board any stop before taking the train to the Pi restaurant downtown. It was a chilly ride as the forecast called for highs in the 25- to 30-degree range, with winds putting the wind-chill factor into the participants.

For one day Mexico City subway commuters seem to live by one philosophy -- take it off. To the surprise of some straphangers, waves of pantless subway riders hit the trains wearing nothing more than their underwear.


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