Digital RS437 - History of the Wazata Division Pole Line - GN Telephony Pre WW II

RS-437 - History of the Wayzata Division Pole Line - GN Telephony Pre WW II

This Reference Sheet explains early (1908) telephone technology and the Great Northern's 1923 pole line rebuilding project to add dispatchers telephone circuits, and to add lines to support the planned instalation of Automatic Block Signals, between Minneapolis and Willmar.

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