Pittsburgh and Castle Shannon Tunnel

The Pittsburgh and Castle Shannon Tunnel, also known as the Mount Washington Coal Tunnel, was a 3 ft 4 in (1,016 mm) narrow-gauge railway tunnel under Mt. Washington.

Source: Wikipedia — Pittsburgh and Castle Shannon Tunnel (CC BY-SA 4.0)

Pittsburgh and Castle Shannon Tunnel

The Pittsburgh and Castle Shannon Tunnel, also known as the Mount Washington Coal Tunnel, was a 3 ft 4 in (1,016 mm) narrow-gauge railway tunnel under Mt. Washington.

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Source: Wikipedia "Pittsburgh and Castle Shannon Tunnel" · CC BY-SA 4.0

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