Today, it’s a godsend—in fact, these days it seems impossible to survive the sticky, humid New York City summers without air conditioning on subway trains. But the subway system wasn’t built with AC. So when did New Yorkers first get the pleasure of a cool train car? Watch our series “When Did The Statue of Liberty Turn Green? And Other Questions About NYC” to get answers to your most pressing, and sometimes most puzzling, New York history questions.