Reply to "PRR Sharknose question"

John SethianOGR Forum Member SUPPORTING MEMBER

The Trainphone worked by inducing a signal in the loco (or cabin Car) antenna, which was then picked up by the rails and transmitted to the Cabin Car (or loco) antenna. Since the coupling of the signal to and from the rails increases with antenna length, the antennas were as long as possible.... full length of diesel roof, full length of Cabin Car Roof, full length of tender deck.

The 25 Hertz AC current in the catenary completely overwhelmed the trainphone signal, so that is why there was no trainphone in electrified territory, as others have pointed out

9/22/2012:58 PM

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