Communication power loss

"Newark Light Rail is subject to delays of up to 25 minutes in both directions between Grove St. and Newark Penn due to communication power loss at Branch Brook Park"

This is a headline lifted from the NJT public website at 9:15am 9/7/16. Does any light rail expert out there know what "communication power" is, and how its loss could cause 25 minute delays?

most likely the code lines to signal system.

Thank you.