The issues began around 5:30 p.m., when the MTA said signal problems prompted them to suspend the entire line -- between 34th Street/Hudson Yards and Flushing/Main Street in Queens.
Even though service started up again just before 7 p.m., the MTA said there are extensive delays, and riders are urged to take alternative subway or bus lines.
The shutdown likely impacts many New York Mets fans going to Wednesday's game against the Phillies, which starts at 7:10 p.m.
Here's a look at the large crowd at Queensboro Plaza in Long Island City during the suspension:
This video from NewsCopter 7 showed the view from above the same station:
Riders took to social media to talk about the suspension of service:
The 7 train is suspended. Have fun getting to that @Mets game tonight, folks!— Emily C. Singer (@CahnEmily) April 19, 2017
Some people said they were even stuck on a train:
@NYCTSubway been stuck on this 7 train for 30 minutes with no announcements - you couldn't tell us this beforehand?!— nadia qurashi (@tarecats) April 19, 2017
This is a breaking news story. Keep checking abc7NY for the latest on this developing story.