The Northern Central Railway (NCR), completed to Sunbury in 1858, was a Class 1 railroad that connected Baltimore City, Maryland, to Sunbury, Pennsylvania. In 1861, the Pennsylvania Railroad acquired controlling interest in the railway. It became such a vital transportation link during the Civil War that it had to be guarded constantly by Union forces. In June 1972, Tropical Storm Agnes heavily damaged much of the NCR right-of-way in Pennsylvania and all but destroyed the right-of-way in Maryland. Then under control of Penn Central, it was decided to repair only the tracks in Pennsylvania and abandon the Maryland section from Cockeysville to the Maryland state line. The majority of the route in Maryland is now the Torrey C. Brown Rail Trail in Baltimore County, and the portion in York County, Pennsylvania, is now the Heritage Rail Trail. The extreme southern end of the line from Baltimore City to Cockeysville in Maryland is now used by MTA-Baltimore Light Rail system.