National Geographic : 1945 Oct
Your New World of Tomorrow 405 . New York Central Ilailroad "Casey Jones" Gets His Orders Now by Radio Direct to His Locomotive Cab Short-wave radio enables the engineman of a yard engine and the yardmaster to talk two ways while sorting freight cars in the New York Central classification yard at Selkirk, New York. The engineer talks into the "mike" before him and gets orders through the loud-speaker behind and above. Radio communication also is coming into use between the engine and caboose on long freights and between trains and control towers.