The FASTRACK maintenance program completely suspends train service over a segment of a subway line to give workers uninterrupted access to tracks, signals, cables, lighting, third rail components and platform edges.
This week, work is being done on the B, D, F and M lines.
From 10 p.m. until 5 a.m., there will be no service at the following 6th Avenue stations: 14th Street, 23rd Street, 34th Street-Herald Square, 42nd Street-Bryant Park, 47th-50th Streets and 57th Street.
D line and F line trains are rerouted to the 8th Avenue line. B line and M line service ends early in Manhattan each night.
For a complete list of changes and for alternative routes please visit: MTA.info