Washington among cities slowing metro rail amid hot weather

Washington, D.C. metro rail authorities announced that the city's commuter train lines would be slowed down to 35 mph on above-ground tracks because of extremely hot weather, a problem faced with increasing frequency in cities across the country. In regards to New York City, Professor Masoud Ghandehari said he doesn't believe it's "financially viable" and may not be "physically possible" to ventilate the subway system to accommodate extreme heat.