A signal problem led to ongoing delays and cancellations on Long Island Rail Road lines coming into and out of Penn Station, MTA officials said Sunday.
Commuters faced 45-minute delays and crowded trains as Metropolitan Transportation Authority workers attempted to fix the signal problem, MTA spokesman Salvatore Arena said.
As of 11 p.m. workers were still trying to fix the signal problem with work expected to continue overnight, Arena said.
It was unclear what impact, if any, the signal work would have on Monday's commute.
Arena said the LIRR "will have an update before the morning rush hour begins," and urged commuters to monitor news reports and the LIRR website, e-mail and social media accounts for updates.
The disruption is due to a signal problem at Harold Interlocking, a stretch of the railroad where multiple tracks converge and trains switch tracks between the Penn Station and Jamaica stops in Sunnyside, Queens, Arena said.