South Pennsylvania Railroad

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Blue Mountain Tunnel (Franklin County, Pennsylvania)
Begun c.1885 by S. Penn. RR; first tube completed 1940 by Penna. Tpk. Comm.; second tube completed 1968
Tunnel on Pennsylvania Turnpike/I-76
Open to traffic

Kittatinny Mountain Tunnel (Franklin County, Pennsylvania)
Begun c.1885 by S. Penn. RR; first tube completed 1940 by Penna. Tpk. Comm; second tube completed 1968.
Tunnel on Pennsylvania Turnpike/I-76
Open to traffic

Laurel Hill Tunnel (Westmoreland County, Pennsylvania)
Begun c.1885 by S. Pennsylvania RR; completed 1940 by Penna. Tpk. Comm.; bypassed and abandoned in 1964
Tunnel on Abandoned alignment of Pennsylvania Turnpike
Currently used to test racecar aerodynamics by Chip Ganassi Racing. Closed to the public.

Negro Mountain Tunnel (Somerset County, Pennsylvania)
Tunnel for Railroad Grade (never used)
Intact but closed to all traffic

Quemahoning Tunnel (Somerset County, Pennsylvania)
Tunnel for Pittsburgh, Westmoreland & Somerset Railroad
Intact but closed to all traffic

Rays Hill Tunnel (Bedford County, Pennsylvania)
Begun ca. 1885 by South Penn. RR; completed 1940 by Penn. Tpk. Comm.; bypassed and abandoned in 1968.
Tunnel on abandoned alignment of Pennsylvania Turnpike
Unofficially open to hikers and bicyclists

Sideling Hill Tunnel (Fulton County, Pennsylvania)
Begun c. 1885 by South Penn. RR; completed 1940 by Penna. Tpk. Comm; bypassed and abandoned 1968
Tunnel on Abandoned alignment of Pennsylvania Turnpike
Unofficially open to hikers and bicyclists

Tuscarora Mountain Tunnel (Huntingdon County, Pennsylvania)
Begun c.1885 by S. Penn. RR; first tube completed 1940 by Penna. Tpk. Comm.; second tube completed 1968.
Tunnel on Pennsylvania Turnpike/I-76
Open to traffic