From "the story of coal and iron in Alabama", (which btw is a good resource for information on civil war iron works and rail lines during the war)

pg. 124: "At the bursting of the storm the South and North Railroad was just approaching the mineral region, having crossed the borders of the Cahaba coal field. Construction work was then suddenly paralyzed for lack of funds. At length Colonel Gilmer succeeded in getting aid from the Confederate Government, and the railroad was extended from Calera to Brocks Gap, near Goold's coal mines.

On pg. 206, "an officer of the United States Engineering Corps" stated in 1868 that "The Selma, Rome,and Dalton Railroad, running directly by Brierfield, is open Selma to Blue Mountain, a distance of one hundred and twenty five miles, and is now to be completed to Rome and Dalton without delay. At Lime station (Calera), this road is crossed by the South and North Railroad, leading from Montgomery to Decatur".