Thus the Act in question established a precedent for a Government taking formal possession of, and exercising complete authority and control over, the whole of such railways as it might require to employ for the purposes of war; although, in point of fact, only such lines, or portions of lines, were so taken over by the War Department as were actually required. In each instance, also, the line or portion of line in question was given back to the owning company as soon as it was no longer required for military purposes; while at the conclusion of the war all the lines taken possession of by the Government were formally restored to their original owners by an Executive Order dated August 8, 1865.

Under the authority of the Act of January 31, 1862, the following order was sent to Mr. Daniel Craig McCallum, a native of Johnstone, Renfrewshire, Scotland, who had been taken to America by his parents when a youth, had joined the railway service, had held for many years the position of general superintendent of the Erie Railroad, and was one of the ablest and most experienced railway men then in the United States:—

War Department.
Washington City, D.C.,
February 11, 1862.

Ordered, That D. C. McCallum be, and he is hereby, appointed Military Director and Superintendent of Railroads in the United States, with authority to enter upon, take possession of, hold and use all railroads, engines, cars, locomotives, equipments, appendages and appurtenances that may be required for the transport of troops, arms, ammunition and military supplies of the United States, and to do and perform all acts and things that may be necessary and proper to be done for the safe and speedy transport aforesaid.

By order of the President, Commander-in-Chief of the Army and Navy of the United States.

Edwin M. Stanton,
Secretary of War.

McCallum commenced his duties with the staff rank of Colonel, afterwards attaining to that of Brev.-Brig.-General. The scope of the authority conferred on him, under the War Department order of February 11, 1862, was widened a year later, when he was further appointed general manager of all railways in possession of the Federal Government, or that might from time to time be taken possession of by military authority, in the departments of the Cumberland, the Ohio, the Tennessee, and of Arkansas, forming the "Military Division of the Mississippi."

The total mileage of the lines taken over by the Federal Government during the course of the war was 2,105, namely, in Virginia, 611 miles; in the military division of the Mississippi, 1,201; and in North Carolina, 293. Much more was involved, however, for the Federal Government than a mere transfer to themselves of the ownership and operation of these lines for the duration of the war.

One of the greatest disadvantages of the American railways at the time of the Civil War lay in their differences of gauge. The various companies had built their lines with gauges chosen either to suit local conditions or according to the views of their own engineers, with little or no consideration for the running of through traffic on or from other lines. There were, in fact, at that time gauges of 6 ft., 5 ft. 6 in., 5 ft., 4 ft. 10 in., 4 ft. 9 in., 4 ft. 8½ in. (the standard English gauge), and various narrower gauges besides. These conditions prevailed until 1866, when the companies adopted a uniform gauge of 4 ft. 8½ in.

During the Civil War the lack of uniformity was in full force, and military transport by rail was greatly complicated in consequence. More than one-half of the lines taken over and operated had a gauge of 5 ft., and the remainder had a gauge of 4 ft. 8½ in., except in the case of one short line, which was 5 ft. 6 in. As locomotives and rolling stock adapted to one gauge were unsuited to any other, the obligations falling upon the Director and General Manager of the Federal Military Railways included that of taking up the lines of certain companies which had adopted the 5 ft. gauge, and relaying them with the 4 ft. 8½ in. gauge, so that the same rolling stock could be used as on lines connecting with them.

Incidentally, therefore, the Civil War in America taught the lesson that the actual value of rail-power as influencing warfare in one and the same country, or on one and the same continent, may vary materially according to whether there is uniformity or diversity of railway gauge.

In certain instances the lines taken possession of were in so defective a condition that it was imperatively necessary to relay them, apart altogether from any question of gauge. When McCallum was appointed General Manager of Military Railways for the Division of the Mississippi, the main army was at Chattanooga, Tennessee, and its supplies were being received from Nashville, 151 miles distant, over the Nashville and Chattanooga Railroad. This was necessarily the main line of supply during the subsequent campaigns from Chattanooga towards Atlanta, and from Knoxville towards South-western Virginia; yet McCallum says of it, in the Final Report he presented to the Secretary of War in 1866:—

The track was laid originally in a very imperfect manner, with a light U-rail on wooden stringers which were badly decayed and caused almost daily accidents by spreading apart and letting the engines and cars drop through them.