The Pittsburgh and Castle Shannon Railroad operated passenger service through the tunnel from 1873 until 1892, after which passengers journeyed instead via the new Castle Shannon Incline, while coal trains continued to use the old route through the tunnel.From 1909 the main passenger service became Pittsburgh Railways streetcars running from the Transit Tunnel into the Castle Shannon route at South Hills Junction.Because of the related nature of the two tunnels, an urban legend persists that the Transit Tunnel was originally a coal mine.Two spectacular runaway accidents are associated with the tunnel, which is on a steep gradient averaging over 6 percent, and curves as the north portal is reached.
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On 9/25/1998 at , a magnitude 5.2 (4.8 MB, 4.3 MS, 5.2 LG, 4.5 MW, Depth: 3.1 mi, Class: Moderate, Intensity: VI - VII) earthquake occurred 75.8 miles away from the city center On 1/31/1986 at , a magnitude 5.0 (5.0 MB) earthquake occurred 101.3 miles away from Pittsburgh center On 7/27/1980 at , a magnitude 5.2 (5.1 MB, 4.7 MS, 5.0 UK, 5.2 UK) earthquake occurred 262.5 miles away from the city center On 1/26/2001 at , a magnitude 4.4 (3.9 MB, 4.4 LG, 4.3 LG, Depth: 3.1 mi, Class: Light, Intensity: IV - V) earthquake occurred 112.3 miles away from the city center On 1/16/1994 at , a magnitude 4.6 (4.6 MB, 4.6 LG, Depth: 3.1 mi) earthquake occurred 207.7 miles away from the city center On 12/9/2003 at , a magnitude 4.5 (4.5 MB, 4.5 LG, Depth: 3.1 mi) earthquake occurred 226.7 miles away from the city center The number of natural disasters in Allegheny County (14) is near the US average (13).
Jones, Alexei Krindatch, Richie Stanley and Richard H.
The tunnel was paved around the rails to allow for joint use by bus and trolley traffic in 1973.
The Transit tunnel is located almost in line with the Pittsburgh and Castle Shannon Tunnel, which was at a much higher elevation. Bureau of Justice, in 2009 more than 2.3 million people were incarcerated and 90% will be released one day.