Archer Avenue lines
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The Archer Avenue lines are two rapid transit lines of the New York City Subway, mostly running under Archer Avenue in the Jamaica neighborhood of Queens. The two lines are built on separate levels: trains from the IND Queens Boulevard Line serve the upper level, and trains from the BMT Jamaica Line serve the lower.
BMT powerhouse, 144th Place and Jamaica Avenue
The former station house of 168th Street station, the former terminal of the BMT Jamaica Line.
View of the Jamaica-Van Wyck station.
A portion of the line constructed using the tunneling shield method near Jamaica–Van Wyck station.
New York City Subway chaining is a method to precisely specify locations along the New York City Subway lines. It measures distances from a fixed point, called chaining zero, following the twists and turns of the railroad line, so that the distance described is understood to be the "railroad distance," not the distance by the most direct route.
Chaining numbers can be seen on the black pillars in the middle of the tracks of West Fourth Street–Washington Square.