The MTA was investigating after there was a loud noise. No smoke or fire were reported.
People who were on board the train posted on social media about the noise:
Just had an explosion on the Queensbound 7-train at Vernon-Jackson. Smoke coming out of the train and people scrambling for the stairs @MTA— Christopher (@CLandry82) February 16, 2016
There will be no express service for the afternoon commute.