Looks like everything normal between GCT and Stamford. East of Stamford, MNR says,
Board link.
"Service is suspended between South Norwalk and New Haven. Westbound service will originate out of South Norwalk making all stops to Grand Central Terminal. Eastbound service will make all stops to South Norwalk."The GCT departure board showed 1588 to New Haven departing OT at 9 37 PM for South Norwalk. They're not showing 1590 or 1594, the 10 22 PM and 11 22 PM trains (normally running to New Haven).
Board link.