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Despite advances in bigger and better locomotives, the addition of automatic block signals, few railroads upgraded their communication links between dispatchers and their network of operators for the transmission and verification of train orders. This is a comparison of the number of miles dispatched using telegraph and telephone between the years 1921 and 1931. There may be some overlap in reporting as some railroads converted to telephone dispatching, but kept the telegraph as a backup system.
*D&SL total mileage in 1921 was 255.
T&P increased telephone use by 209 miles in 1920. T&P total mileage in 1921 was 1,832.
WP total mileage in 1921 was 1,015.