“Carryphone” Aids Trainmen (Apr, 1947)
Wow! Look how portable and convenient it is!
“Carryphone” Aids Trainmen
Engineers and trainmen can keep in constant touch with their own crews or talk with the crews of other trains with the “Carry-phone,” a portable telephone announced by the Pennsylvania Railroad. The device uses railroad tracks or wires as its communication channels, but transmits and receives messages through the air by induction, using a large metal loop.