The one M3 in the shop is 9775. It's mate long gone. Work had begun to make this an alcohol/sandite to replace the M1 sandites. For wahtever reason they decided to pull the plug on it, maybe they'll go to an M7 sandite.
A 4 car set of M7A's were transferred between Metro North & Long Island Railroad crews for a move to Arch Street Shops in Long Island City via Amtrak's Hell Gate Line. Metro North North Extra 102 brought the cars from Croton Yard to New Rochelle Station. After handed to the Long Island Railroad crew, the cars are towed from New Rochelle Station to Arch St Shops. All of Metro North's M7A railcar fleet will make the journey to LIC little by little to have PTC (Positive Train Control) equipment installed by Bombardier.
Pairs brought down on this move; -MNCR 4146/4147 -MNCR 4105/4104
There is a set of LIRR M7s outside the building in the yard. Maybe they will make them sandite. They have the car number on the middle of the car under the window unlike the other M7s I have seen in service. I believe one car number was 4100.