Today on my way home from NYC I was on my train waiting in the Stamford station when a southbound diesel Shoreliner IV (in the MTA blue, not CDOT red) consist pulled in. I didn't think anything of it until my train started pulling away and I saw the loco – it was an F-unit (not sure if an FL-9 or an F-10) painted in the New York Central colors! I knew there was one loco like that on the premises in the New Haven yard but I didn't know it ran in revenue service. Perhaps it was the Danbury shuttle? I had a camera, but as I said I though nothing and it was too late to pull out my camera by the time the loco came into view -- sorry.