Trowbridge Interlocking Tower, c. 1966.  The tower sits in the southwest corner of this busy main line crossing of the Chesapeake & Ohio and the Grand Trunk Western Railroads.  This view looks east on the C&O.  There is a Form 19 train order signal displayed for westbound C&O trains at the tower.  Forty years later, this tower is gone and the then-barren countryside has now been developed.  [Charlie Whipp photo].