Trans-Allegheny Interstate Line | Pennsylvania & Virginia, US An early method of high-voltage direct current transmission was ?rst installed in Italy in 1889, transmitting 14 kilovolts over a distance of 120 kilometers. By the early 20th century, electricity transmitted by lines and grids ushered in a modern way of life for most industrialized nations. Challenge The proposed Trans-Allegheny Interstate Line (TrAIL) called for the construction of a new 240-mile transmission line from southwestern Pennsylvania to northern Virginia. It would include three 138-kilovolt lines south of Pittsburgh and nearly 180 miles of 500-kilovolt lines linking substations in Pennsylvania, West Virginia and Virginia. Solution Louis Berger was retained by TrAILCo (an Allegheny Energy subsidiary) to conduct a sit

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