If you live in New York City, check your subway line before you swipe your Metro card.
In the midst of a sweltering Friday rush hour, the Metropolitan Transit Authority announced a cascade of train delays due to a "network communications issue."
Trains affected include the 1, 2, 3, 4, 5, 6 and Grand Central-42 St S lines. The delay affects trains traveling in both directions, with some trains stopped in between stations.
Some subway riders reported up to 90 minutes of waiting on underground trains.
"If you are on a train in between stations, please remain on your train and listen for crew instructions," the MTA tweeted. "We are working as quickly as possible to bring customers into stations safely."
The MTA urged people to take lettered lines or buses rather than the subway, saying extensive delays continue to be expected as service is restored.
1,2,3,4,5,6 trains not running because of a "network failure." Scene from 42nd Street. Moms unable to climb the stairs with their strollers, people fanning themselves, a fight that broke as people tried to get into a car and the C train nowhere to be found @MTA pic.twitter.com/odCulGw2ml— Andrea Salcedo (@salcedonews) July 19, 2019
Lines starting to come back include the 1/2/3, 4/5/6, and 42 St Shuttle, as the MTA works to "restore the connection between the signaling system and the Rail Control Center."The MTA did not say when they expect the system to be fully operational.
Passengers can see a station agent for a courtesy pass for continued bus or train service. Additionally, they said Metro-North is cross-honoring MetroCard holders at impacted stations along the 1, 2, 3, 4, 5 and 6 lines for alternative travel.
As of 8:30 p.m., some northbound trains were further hampered, including the B and Q trains.
"Northbound B and Q trains are delayed because of a signal problem at 7 Av (BKLYN). Some northbound Q trains will run on the N line from Coney Island-Stillwell Av to DeKalb Av," the MTA tweeted.
And when 7 trains were halted Friday night, train riders continued to express outrage. "You're kidding me. There is almost no way to get to Brooklyn, to Manhattan and then Queens ... We need clear communication!!!" demanded user @MatchforR.
Earlier, the MTA said the B train will run to and from the Bronx after rush hour for those impacted by the 4 train's suspension.
Rolling updates are available on @NYCTSubway on Twitter.
As the subway system struggled to regain operations, Mayor Bill de Blasio blasted the MTA for the shutdowns, which come as New York City faces a record-breaking heat wave.
"This kind of meltdown during a heat wave is UNACCEPTABLE," he tweeted. "The MTA owes every single New Yorker an explanation for this. We've known about this dangerous weather for DAYS. There’s no excuse for why they aren't prepared."
This kind of meltdown during a heat wave is UNACCEPTABLE. The MTA owes every single New Yorker an explanation for this. We've known about this dangerous weather for DAYS. There’s no excuse for why they aren't prepared.— Mayor Bill de Blasio (@NYCMayor) July 19, 2019
The mayor noted extreme crowding as "hot and frustrated" crowds waited during the evening rush.
"The NYPD has dispatched additional officers to help manage the extreme crowding on platforms and in stations," he tweeted.
Other New Yorkers took to Twitter to vent their frustration.
"Being trapped in a hot subway car in the tunnel for a half hour, followed by having to ride 5 different lines to get to your destination due to a whole host of nyc subway technical errors is enough to make a girl believe in this whole mercury retrograde business," Gabriella Ziccarelli tweeted.
Being trapped in a hot subway car in the tunnel for a half hour, followed by having to ride 5 different lines to get to your destination due to a whole host of nyc subway technical errors is enough to make a girl believe in this whole mercury retrograde business.— Gabriella Ziccarelli (@IPwithGZ) July 20, 2019
"This is completely unacceptable @MTA," NYC Comptroller Scott M. Stringer wrote. "Service is suspended and platforms are boiling. New York cannot function like this."
This article originally appeared on USA TODAY: NYC subways down: MTA suspends several lines during heatwave Friday