Abstract :
IN ITS ELECTRIFICATION in and around Philadelphia, the Pennsylvania Railroad has made use of two installations of supervisory control for the remote operation of high voltage a-c. step-down substations. In a current A.I.E.E. paper (see footnote) C. P. West (M´28) Westinghouse Electric and Manufacturing Company, East Pittsburgh, Pa., and H. C. Griffith, Pennsylvania Railroad Company, Philadelphia, Pa., describe some of the features of the installation and relate in detail how some of the difficulties encountered were solved.
