2011 - Union Dam Tunnel, Patapsco State Park, Baltimore, MD

As is usual with geocaching, we discover sites that you would not otherwise even know exist.  While visiting Patapsco Valley State Park to find Maryland's oldest active geocache, we stumbled upon the Union Dam Tunnel.  The railroad tunnel, which was built in 1902, is 810' long.  Better yet, as we approached the tunnel, we could hear train whistles in the distance.  Sure enough after a five minute wait, a four-locomotive train comes blowing around the corner and into the tunnel.

Enjoy the photographs (click thumbnails for larger view)..

2011 - Union Dam Tunnel, Patapsco Valley State Park, Baltimore, MD Active Railroad sign Active Railroad sign

2011 - Union Dam Tunnel, Patapsco Valley State Park, Baltimore, MD The tunnel entrance The tunnel entrance

2011 - Union Dam Tunnel, Patapsco Valley State Park, Baltimore, MD The end of the train headed inside The end of the train headed inside