The Metropolitan Transportation Authority's FASTRACK program comes to the A, B, C and D lines tonight.
For the next four nights, there will be no A train service between 59th Street-Columbus Circle and 168th Street and no D service between Columbus Circle and 161st street-Yankee Stadium.
B and C service will end early each night.
The work is expected to take place each night from 10 p.m. until 5 a.m. the next morning.
For more information, visit mta.info.