Through the courtesy of A. J. Whitney, general superintendent, Northern Grand division, Central region, Pennsylvania System, and A. H. Rudd, chief signal engineer of the Pennsylvania System, the following information was developed from interviews with Wm. Metzger, 88 years old, of Irvineton, Pa., once an engineer on the Philadelphia & Erie; Associate Judge J. W. Hughes, of Warren, Pa., formerly yard master at Irvineton; John Christie, car inspector at Irvineton, and J. C. Curtis, formerly a train dispatcher on the Renovo division. "About 1872, Dr. Robinson, who probably came from Altoona, erected a signal governing westward movements, near Irvineton. This signal was located just west of Irvine Run bridge, on the north side of the main track (this track is now an eastward track), in a small frame building adjacent to the track and was electrically operated back of a circular opening about two feet in diameter, by display of a red flag during the day and a light in the rear of the flag by night. A bell was also located in the signal shanty and another bell in the telegraph office of the station, located at the junction of the two railroads (see sketch). A trip device, operated by the wheel flange, forced contact with wires carried on the telegraph poles and operated the signal and bell in the signal shanty as well as bell in the telegraph office. The signal was known as the "Old Reliable" and the words "Dr. Robinson's Patent" were painted around the circular opening. "Another pair of signals was installed by Dr. Robinson at Kinzua, now Ludlow, for protection of trains stopping at Kinzua (Ludlow) station. These signals were operated by overhead wires as at Irvineton. When a train was opposite one of the signals, it set both signals to red indication by operating a red flag within a circular opening in the daytime and a light in the rear of the flag at night. A loud gong was also installed in each shanty which rang coincident with the signal going to the red indication. When the rear of the train passed the signal in advance both signals returned to clear and the bells stopped ringing. This system was operated with batteries and was removed in less than a year on account of the difficulty of maintaining the batteries." Biographical Sketch of W. A. Baldwin The biographical sketch of Mr. Baldwin, as given below is taken from the Biographical Directory of the Railway Officials of America--Edition of 1906. BALDWIN, WILLIAM ASHBRIDGE, president, Cleveland & Marietta Ry. Office, Pittsburgh, Pa.