"After the coal was removed, the mine became part of an underground
transportation system to transport coal from the South Hills to
industries along the Monongahela river. The "coal road" passed under
three hills, under Mount Oliver, Pennsylvania, then a trestle over a
ravine at the present location of Parkwood Road, then under the hill
topped by Fort Jones, later St. Joseph's Roman Catholic Church[2] and
St. Clair Village, then over another ravine at the present-day Wagner
Street, to re-enter an underground mine section in Carrick near where
Bruner Street is today.[3][4] This mine connected with the Bausman
Mine in Spiketown, now Carrick, and was still operational in 1899.[5]
Coal was tranferred from Spiketown to the mine entrance on St. Patrick
Street by a steam locomotive that ran undeground.
The coal from the
mine was transferred to a narrow gauge railroad that ran down the
middle of South 21st Street from an inclined plane railroad.[6][7]
Although the incline is no longer in existence, its site is occupied
by South Side Park, which was also a location of a Sankey brick works.
When the enginehouse of the coal road burned shortly before the
expiration of Keeling's lease on the mine, the lease was not renewed;
At about the same time, the Pittsburgh and Whitehall Railroad obtained
an easement adjacent to the track in the center of South 21st St.[8]"
Now you know!
John Rudiak