N.J. Transit says light rail, bus service to be fully restored after blizzard. Rail service will be limited.

Earlier on Monday, service on the light rail system resumed on limited schedules after being suspended due to the blizzard.
Gothamist

NJ Transit to resume rail, bus service Tuesday with major changes

Newark Light Rail and River LINE restart Monday afternoon. Most rail and bus service still halted after the blizzard.

NJ Transit light rail returns and truck ban, reduced speeds lifted on area expressways as monster blizzard winds down

Light rail lines first of NJ Transit service to return, Turnpike, Parkway speeds return to normal after blizzard.

Here's when service disruptions for NJ Transit riders should end

The service cuts are being caused by a track switch to a new Portal North Bridge over the Hackensack River. That project, at least, is on schedule.