| Overview | |
|---|---|
| Location | Pittsburgh, Pennsylvania |
| Coordinates | 40°25′41″N 80°00′19″W / 40.42811°N 80.00517°W |
| Status | closed |
| Start | above Carson Street |
| End | above Warrington Avenue[1] |
| Operation | |
| Work begun | 1825, as a mine |
| Constructed | conversion of former coal mine |
| Opened | November 1, 1871 |
| Closed | 1912[2] |
| Technical | |
| Length | 1,741 feet (531 m), with 1,766-foot (538 m) extension branch |
| Track gauge | 3 ft 4 in (1,016 mm) |
| Tunnel clearance | 12.5 feet (3.81 m) |
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.