The 13 miles ( 21 km ) west of Georgesville went under grading contract in September 1848 .
The last 15 miles ( 24 km ) to Xenia were under contract two months later .
The 13 miles ( 21 km ) west of Georgesville went under grading contract in September 1848 , and the last 15 miles ( 24 km ) to Xenia were under contract two months later .