The State Line Depot is a Kentucky Historic Landmark as designated by the Kentucky Heritage Council. It was constructed in 1901 by the Nashville, Chattanooga, and St. Louis Railroad. The NC and St.Louis Railroad aspired to bridge the Mississippi River near Hickman, a project lost in the shadows of time. The building itself is 20 feet by 40 feet and constructed of stucco and wood. The wood parts were painted a deep orange brown. There are two doors, one on the track side and one on the side of the building. Two cargo doors still operate on the front and back of the depot for loading and unloading bulk materials to the train. The cargo area is elevated by 5 feet to make it on the same level as the train cars. Before the time of the depot, the stop on the rail line was known as Matson's Switch. Robert Matson was hired to build the portion of the rail line from the Tennessee line to Shuck's Switch. He had his slaves to construct the railroad bed.