The VGN had a very major grade at Clark's Gap, West Virginia, and tried large steam locomotives before turning to an alternative already in use by one of its neighboring competitors, Norfolk & Western Railway: a railway electrification system. With work authorized beginning in 1922, a 134-mile portion of the railroad in the mountains from Mullens, West Virginia over Clark's Gap and several other major grades to Roanoke, Virginia was equipped with overhead wires supported by a catenary system. The VGN built its own power plant at Narrows, Virginia. The electrification was completed in 1925 at a cost of $15 million, equal to $ today. A link was established with Norfolk & Western to share electricity from its nearby electrification during contingencies. ALCO and Westinghouse supplied the electric locomotives, which were equipped with pantographs. The 36 initial units were normally linked in groups of three as one set, and had much greater load capacity than the steam power they replaced. In 1948, four huge EL-2B twin-unit locomotives were purchased, followed by twelve EL-C rectifier locomotives in 1955.