7 train yard in Corona Park, Queens
Image: Patrick X. Liu
If you take the 7 train line towards Flushing, get off at the Mets/Willets Point Station. From there you can cross over a pedestrian bridge that leads into Flushing Meadows Park in Queens. Around here is where you can snag a decent picture of the Corona Yard - a major train storage trackage for the IRT division of the New York City Subway system.