Question: Who wrote a story recalling his adventures crossing the St. Lawrence Atlantic Railroad  with fellow students during the American Civil War?

Context paragraphs:
New Mexican Railway Company: The New Mexican Railway Company was incorporated in the Territorial Legislature of New Mexico on Feb 2, 1860, prior to the beginning of the American Civil War.  Corporate members were Henry Connelly, Antonio J. Otero, who served as a justice of the New Mexico Territorial Supreme Court; Ambrosio Armijo (the father of Colonel Perfecto Armijo); José Felipe Chavez, Francisco Chavez; Spruce M. Baird, a judge sent by Texas during the U.S. provisional government of New Mexico to organize their claimed land east of the Rio Grande as the Santa Fe county of Texas; Francisco Perea, José Leandro Perea, who was the uncle of Francisco, Charles B. Clark, José Guadalupe Gallegos, Stephen Boice, William H. Moore, Ceran St. Vrain, Thomas C. de Baca, Merrill Ashurst, Duff Green, John Titus, David R. Porter, Oliver W. Barney, and Philip L. Fox.  The "Memorial of the New Mexican Railway Company, in Relation to the Pacific Railroad" was introduced by Miguel Antonio Otero in the United States Congress on May 21, 1860.  It was an argument in favor of the southern route for a transcontinental railroad.  Arguments over the central vs. southern route were a part of the complex of insoluble relations between states, dating back to James Gadsden's involvement in 1845 (as described in the discussion under the Gadsden Purchase).  These arguments contributed to the outbreak of the American Civil War.  The New Mexican Railway Company was formed in conjunction with the attempt to retain rights of in-state railroad construction oversight within the Territorial government.  The act of incorporation stated that company rights and privileges would be forfeited if construction had not begun within a period of five years.  Beginning in 1862, after the outbreak of Civil War, the Union Pacific Railroad and the Central Pacific Railroad of California were granted lands and construction privileges for the First Transcontinental Railroad project under the Pacific Railway Acts.  Construction of this Overland Route was begun in 1863 and completed in 1869.  The southern route did not become a reality until 1883, when the Southern Pacific Railroad linked New Orleans and the Gulf of Mexico with Los Angeles and the Pacific Ocean.

Calhoun Depot: The Calhoun Depot was a railway station of the Western & Atlantic Railroad that was built by the State of Georgia during 1852-53 in Calhoun, Georgia.  Unusual for railroads, the Western & Atlantic Railroad was owned and operated by a U.S. state.  Calhoun is on its route built from Atlanta, Georgia to Chattanooga, Tennessee.  Like other brick or stone depots on the line, the Calhoun Depot was involved in but survived the American Civil War.  It was part of the Great Locomotive Chase.

Chalk Bluff, Arkansas: Chalk Bluff was an unincorporated community in Clay County, Arkansas, United States, approximately 2 mi (3 km) northwest of St. Francis, Arkansas.  The town was formed in the 1820s at the point where the St. Francis River cuts through Crowley's Ridge from west to east.  The name of the community was derived from the white clay bluff created by this crossing.  The founder of the community was Abraham Seitz who established and operated a ferry crossing and general store in the area from the 1830 until it was destroyed during the American Civil War.  The community occupied a strategic location and was often referred to in the reports of Union and Confederate forces vying for control of Northeast Arkansas during the war.  The crossing was the site of several skirmishes, the most significant being the May 1–3, 1863 Battle of Chalk Bluff.  The town was abandoned following the Civil War and most residents moved to the new railroad town, St. Francis, Arkansas.  The location was listed on the National Register of Historic Places in 1974.

The Young Moose Hunters: The Young Moose Hunters is an 1882 story by C. A. Stephens.  The story recounts the author's recollections of his adventures with fellow Paris Hill Academy students Henry Scott Whitman and Fred Bartlett during the American Civil War.  The students travel over the St. Lawrence and Atlantic Railroad and then walk to Lake Umbagog where Bartlett's friend, Charles Henry Farr, has a boat they row to Parmachenee Lake.  There the four teen-agers camp in the woods catching trout, trapping furs and gathering spruce gum to sell earning money for tuition, board and room while attending school.

The Texas (locomotive): Western & Atlantic Railroad #49 ""Texas"" is a 4-4-0 "American" type steam locomotive built in 1856 for the Western & Atlantic Railroad by Danforth, Cooke & Co., best known as the principal pursuit engine in the Great Locomotive Chase, chasing the "General" after the latter was stolen by Union saboteurs in an attempt to ruin the Confederate rail system during the American Civil War.  The locomotive had been preserved at the Atlanta Cyclorama building within Grant Park in Atlanta, Georgia, and is listed in the National Register of Historic Places.

Track gauge in Canada: The first railway in British North America, the Champlain and St. Lawrence Railroad, was built in the mid-1830s to track gauge.  This was followed by the Albion Colliery tramway in and the Montreal and Lachine Railroad in .  However the promoters of St. Lawrence and Atlantic Railroad, (intended to connect Montreal to the ice-free port at Portland, Maine) decided to use , setting a precedent for the colony for several decades.  The first section from Longueuil to St. Hyacinthe opened in 1847 and at the end of that year there were 30 mi of broad gauge and 22 mi of standard gauge in Canada.

Grand Trunk Station (Oxford, Maine): The Grand Trunk Station was a historic railroad station in Oxford, Maine.  The station was built in 1883 by the Grand Trunk Railroad linking Oxford with Montreal and Portland, Maine.  The village grew especially after the arrival of the St. Lawrence & Atlantic Railroad toward the end of 1840.  The railroad opened the village to several business ventures between Portland and Montreal.  The railroad passes through the midst of the town, in the same general line with the river, and has a station (Oxford Depot) a short distance south of the centre.

The General (locomotive): Western & Atlantic Railroad #3 "General" is a 4-4-0 "American" type steam locomotive built in 1855 by the Rogers, Ketchum & Grosvenor in Paterson, New Jersey for the Western & Atlantic Railroad, best known as the engine stolen by Union spies in the Great Locomotive Chase, an attempt to cripple the Confederate rail network during the American Civil War.  Today, the locomotive is preserved at the Southern Museum of Civil War and Locomotive History in Kennesaw, Georgia, and is listed on the National Register of Historic Places.

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.

Grand Trunk Station (Mechanic Falls): The Grand Trunk Station was a historic railroad station in Mechanic Falls, Maine.  The station, located on Elm Street, was built in 1883 by the Grand Trunk Railroad linking Mechanic Falls with Montreal and Portland, Maine.  The village was named Mechanic Falls in honor of mechanics who worked there during the industrial revolution.  The village grew especially after the arrival of the St. Lawrence & Atlantic Railroad toward the end of 1840.  The railroad opened the village to several business ventures between Portland and Montreal.

Supporting paragraphs: The Young Moose Hunters St. Lawrence and Atlantic Railroad
Answer: C. A. Stephens