In 1967 George Elwood photographed the two towers that controlled rail traffic in Ashtabula, Ohio from well before World War II, OD and NP Towers. Today, both are gone. OD was operated by the New York Central and through its interlocking controlled east-west and north-south crossing traffic of the PRR on its P.Y.&A. (Pittsburgh Youngstown and Ashtabula) branch and the NYC on its Youngstown branch. East-west NYC water level traffic always took preference. About a mile or so south, another railroad, the Nickel Plate and later the Norfolk & Western (today's NS) paralleled the NYC toward Cleveland. NP Tower and its interlocking controlled the PRR (P.Y.&A.) and NYC (Youngstown Branch) crossovers. As with the NYC east-west main, Nickel Plate traffic always came first.
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