Other defect detectors on the line are tied to the signal system. Audible defect detectors are shown at left as red dots. Wayside signals are coupled to a cab signal and automatic train control system between RO, just south of the Potomac and Greendale, at the north end of Richmond's Acca Yard. VRE has funded the construction of an additional set of crossovers at Featherstone. Frequently spaced crossovers allow for easy bi-directional movement. Federal BESTEA funding will pay for the work. Note: this bridge is scheduled to be upgraded with the additional of a parallel double-track structure. The line is heavy duty construction: two main tracks over its entire length, except for the bridge at Quantico. Potomac Yard in Alexandria is completely abandoned. Richmond's Acca Yard is still a major CSX hub and maintenance facility. Both ends of the property had major yards. It was as a vital link between north and south, connecting the Pennsylvania Railroad and B&O of the north with the Atlantic Coast Line and Seaboard Air Line of the south. Almost from the beginning, the road carried bridge traffic and inter-road passenger trains. Virginia's first railroad retained its operational independence and the name Richmond, Fredericksburg and Potomac from its founding in the 1830s until 1992, when it was folded into CSX Transportation.
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