The New York City subway is sprawling system, with more than 5 million people per day (and sometimes many more, on special occasions) passing through more than 460 stations. There is probably someone who knows more about the intricacies of the system than Max Diamond, but whoever it is, I don't know him or her.

Diamond is a transportation engineering student at the City College of New York and a "rail fan"—he studies budgets and plans, delves into contracts and historical minutia, and, of course, pays close attention whenever he's riding the subway. Every time he rides it, he brings a camera on the off chance he spots something that's not quite right.

Diamond runs the DJ Hammers YouTube channel, which features roughly 1,500 videos shot on the subway. These videos feature trains entering and leaving stations, new and rare subway announcements, subway rails catching fire, and lots of other sorts...

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