Engineer (Finnemore) of steam locomotive communicating by radio

A CNR executive tests radio communication with a locomotive

Dispatcher transmits train orders

Engineer of diesel locomotive receives train orders

Train crewman communicates by radio

Centralized traffic control, Moncton to Halifax

CTC control chart records Moncton to Halifax train movements

Switch telephone station Centralized Traffic Control, Moncton to Halifax

Levermen at CTC Board Wellington Tower

A signals supervisor taps a line with a telephone

A communications dispatcher at Central Station

Yardmaster, Toronto Terminal railways John Street tower

Levermen at CTC Board Wellington Tower

Battery room of the Wellington Tower

Two way radio communication from Central Station's control tower to diesel locomotive

Dispatcher at the CTC panal, Port Arthur

A CN employee uses a remote control device to operate a diesel locomotive on the Great Slave Lake Railway in 1968