Who wrote a story recalling his adventures crossing the St. Lawrence Atlantic Railroad  with fellow students during the American Civil War?
St. Lawrence and Atlantic Railroad The St. Lawrence and Atlantic Railroad (reporting mark SLR) , known as St-Laurent et Atlantique Quebec (reporting mark SLQ) in Canada, is a short line railway operating between Portland, Maine, on the Atlantic Ocean and Montreal, Quebec, on the St. Lawrence River. It crosses the Canada–US border at Norton, Vermont, and is owned by short line operator Genesee and Wyoming.
Beyond the Wall (short story) "Beyond the Wall" is a ghost story by American Civil War soldier, wit, and writer Ambrose Bierce. It was published by "Cosmopolitan" in December 1907.