It's the fourth of six bridges Metro-North Railroad is replacing across the New Haven Line in downtown Mount Vernon.
The work will give the bridge a higher clearance to it might not be hit by trucks entering the parkway by mistake.
Railroad officials said there were still residual delays.
Crews will perform construction activities, weather permitting, between I-95 and the Cross County Parkway.
The daytime work should avoid rush hour, but still...
No one was on the northbound platform at the time of the incident.
The bridge, built in 1894, goes over the New Haven Line.
Westchester County Police said motorists should expect delays.
Motorists are advised that the previously scheduled closure of the Hutchinson River Parkway is postponed due to forecasted weather.
Expect delays. Take alternate routes. Pay attention to flaggers.
Northbound traffic was diverted onto the Cross County Parkway for hours.