Flooding caused delays on multiple New York City subway lines Monday as torrential rain pummeled the Tri-State Area.

Platform edge barriers have now been installed at 56 New York City subway stations as part of an ongoing Metropolitan Transportation Authority safety initiative, with the goal of installing the barriers at more than 100 of the subway system’s 472 stations this year.

The century-old system is being hit with more powerful and frequent storms, and it will take a multiagency effort to fix it.