New York City's Grand Central Station is one of the busiest train terminals in the U.S. – and sure to be even busier with the approaching July 4 holiday. Visitors won't notice, but the massive terminal has undergone energy efficiency upgrades expected to save a whopping $3.3 million and cut carbon emissions by 10,000 tons annually. See how they did it.
A New York firm thinks MTA, which runs the New York City transit system, should consider sending messages to riders' cell phones based on their travel location. What makes the idea possible is something called “beacon technology.”