Subway train cars detach in the Bronx, causing service disruptions on 4 and 5 lines

According to the MTA, there was a decoupling between the third and fourth car of a No. 4 train, meaning the cars separated.
Gothamist

Subway train comes apart in Bronx tunnel, no injuries reported. MTA calls incident 'unusual.'

A subway train came apart in transit Sunday in the Bronx, suspending some service on the 4 and 5 lines but resulting in no injuries, MTA officials said.