I will be a little "out of season" for my story......
I grew up in the in the Pelham Bay section of the northeast Bronx in the 50s and 60s.
More towards the Central Bronx, Tremont Avenue, north of Parkchester, parallels the New Haven line headed for the HellGate bridge. Between St Raymond's Church (Castel Hill Ave) and Unionport Rd there was a small New Haven freight yard (that by the late 60s had been replaced by the Dept of Motor Vehicles).
As a youngster, I remember going there to buy Christmas trees right off the boxcars.....2x4s were nailed together as an awning and colored lights strung on then. A wood fire in an empty 55 gallon drum warmed everyone up.
Peter