STAMFORD - Commuters on Metro-North's New Haven Line must remain vigilant as limited service continues to plague the railroad system.

Massive delays have affected riders since a feeder cable failed last week near the Mount Vernon substation. Diesel trains have been running on the tracks between Stamford and Grand Central Terminal, but only sporadically.

Travelers say listening to station announcements has proven vital, especially since the platforms have been overcrowded. Information screens have also proven to be a much-needed resource.

Metro-North officials say trains are expected to carry 50 percent of normal ridership throughout the day.