A central part of the project was to upgrade the subway signals and Eyewitness News got an exclusive look at some of that work.
The MTA says the crosstown line used by the G train still has its original signal system from when it opened over 90 years ago.
Now the MTA is installing new technology to make the line more reliable.
Phase 2 of the work has been completed, which restored service between Court-Square and Bedford-Nostrand Avenue early Monday morning.
G trains will not run between Bedford-Nostrand Avenue and Church Avenue.
There is a free shuttle bus service making all G stops between Bedford-Nostrand Avenue and Hoyt-Schermerhorn Street stations.
"I mean if it's true that's good, but I don't believe it," a commuter said. "Definitely a worth investment and it'll be easier for us to move around."
This phase is expected to be complete on Tuesday, September 3.
The MTA wants to fully upgrade the signal system on the crosstown line by 2027.
ALSO READ | 90-year-old faces eviction of his Brooklyn home after discovering decades-old scam
90-year-old man fighting eviction from Brooklyn home after falling victim to a scam
----------
* More Brooklyn news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube