"There are people on the express track walking toward 59th."

The express tracks run underneath on a lower level and are not visible from the platforms.

A full curtain wall separates the local from the express tracks.

Some of the columns between the express tracks have black "42" signs on a white background.

There are two elevated structures above the express tracks used for office and maintenance space.

The station has two island platforms, situated between the express and local tracks in each direction.

The B trains are rarely, if ever, switched to the express track, he said.

The 2 and 3 trains are back on the express tracks in Manhattan.

In this case, however, the express track continues through.

Both ends of the track connects to the express tracks.