Almost 58 DE Locos out of 160 DE Locos have been equipped with ATP and Cab Signal
till June, 2015.
The upgrade would also pay for new cab signal
controls, cutting significant time off the current 1-1/2 hour ride from Fitchburg to Boston.
Dammond shortly thereafter relocated to Detroit, Michigan, and located employment as an assistant bridge engineer at the Michigan central Railroad where he invented "an electric cab signal
, an improvement over, and destined to supplant, the block signal." [xii]
But a loss of fresh air inside the cab signals
you to remove the filter element to see if it's clogged with dust and sand.