A Clever Commuter shared this message 14 minutes before MTA did.
[8:07 AM] – 734 to Stamford stopped due to overpass problem at Mount Vernon East
[8:12 AM] – 7:34 out of GCT and all trains blocked by a vehicle fallen on the tracks at Mt vernon overpass–reportedly a one hour delay
MTA [8:21 AM] – New Haven Line service is temporarily suspended due to an automobile on the tracks in the vicinity of Mt. Vernon East.