AirTrain JFK
History
Construction of the system began in May 1998. Most of the system was built one span at a time, using cranes mounted on temporary structures that erected new spans as they progressed linearly along the structures. Several sections were built using a balanced cantilever design, where two separate spans were connected to each other using the span-by-span method. The Jamaica branch's location above the median of the busy Van Wyck Expressway, combined with the varying length and curves of the track spans, caused complications during construction. One lane of the Van Wyck had to be closed in each direction during off-peak hours, causing congestion.
AirTrain JFK-15