https://books.google.com/books?ei=SoiATM-UGIGB8gbRmrCEBA&ct=result&id=daNJAAAAMAAJ&dq=%22pensacola+and+atlantic+railroad%22+cost+of+construction&q=%22pensacola+and+atlantic+railroad%22+ "Pensacola and Atlantic Railroad," Poor's Manual of Railroads, 1885, Volume 18, page 453] On May 30, 1886, the Louisville and Nashville changed the gauge of all its lines (over 2000 miles of track) to 4ft9in in a one-day system-wide effort requiring the labor of about 8,000 men from dawn to dusk.