| Here is the 21st of 36 plates constituting the "Centennial Album of Pennsylvania R.R. Photos and Prints." It was published in the April 1946 issue of "Railroad" magazine, page 30. Photo Caption: "Signals. In the field of railroad signaling, no carrier has contributed more than PRR to the safe operation of trains. From the drover's horn down through baloon-, ball-, and banner-indications, the lower- and upper-quadrant semaphore, position light- and coded-cab-signals, the Standard Railroad of the World has kept abreast of latest developments. Today's train telephony carries this progressive record one step further." |