In the mid 20th century, N&W merged with long-time rival Virginian Railway in the Pocahontas coal region and grew even more in size and profitability by mergers with other rail carriers including Nickel Plate Road and Wabash in adjacent areas to form a system serving 14 states and a province of Canada between the Atlantic Ocean and the Mississippi River and Great Lakes with more than 7000 miles of trackage.