There was a roundhouse for the NYC's Harmon Yards.
From what I remember it was on the northwest side of the property of the shops, right up against where the Half Moon Bay condo development is.
I think it was demolished in the 1950's.
From friends of mine who work there, I've heard that there are still underground service chases that go between the old round house location and the main shop building.
5th generation from Harmon (Croton-on-Hudson, NY), home of the MTA MNRR Harmon Shops.
B.S. Elec. Eng. Tech., Rochester Institute of Tech.
"I have problems sleeping at night when I can't hear the idling of several GE locomotives reverberating off the hills."