The Old Town section of Alexandria, Virginia is packed with significant sites and artifacts, as echoes of the past dot the streets of this historical section. One intriguing vestige of this city’s past often overlooked is nestled in a suburban tract, several blocks removed from the hustle and bustle of King Street. At the corner of Wilkes Street and Royal Street is the entrance to a former railroad tunnel that belonged to Orange & Alexandria Railroad completed in 1856. It was used in both the Civil War and World War I…