A retired Engineer friend of mine send me this, dont know the date, guessing 76 or 77 because of the red white and blue.

As mentioned by others this is definitely East Farmingdale back around 1980 is my guess.
A big misconception about the LIRR color schemes is that many think that this is from the Bicentennial era
but it is actually from the Gabreski era(former LIRR President Frank Gabreski) just a few years later when the large scale use of red/white/blue
paint on LIRR equipment was used. Remember only GP38 #252 got this color scheme originally and was the prototype
used in the Gabreski era.
Another tip-off in the picture - no third rail - as for the early 80s date. It was just a few years later that that
track was electrified beginning in 1987 I believe...
MACTRAXX