That is neat and a great use of an old structure that would just decay and become a hazard if it were not used for something today. I do know of an old rail tunnel that was converted to grow mushrooms just outside of Kennet Square, PA. back in the early sixties but do not know if it is still being use as such today. This article and clip makes me think about all those days as a youngster riding my bike all around the area where I lived with my friends of that time. Sure was a much simpler time back then.
As a kid growing up in PA. and having traveled on the PA Turnpike (RT 76) in the fifty's and early sixties with my parents and as a young man driving the PA Turnpike from Pittsburgh, Pa to just outside Philadelphia, Pa I do not recall ever going through any place call Laurel Hill, Pa. but it is most likely a little farm community that is along side of the turnpike and forgotten by most people except the locals kind of like the town in the movie CARS (Radiator Springs) and old Rt 66.