I live near CN route between Detroit and Pontiac ( Pontiac sub?)
There was a track defect detector located near where the railroad crosses Maple rd. ( 15 mile rd).
I think it used to announce mile post 17.8.
It used to sound terrible, like it needed a new power supply ( excessive ac hum).
Now it no longer reports trains northbound or southbound.
I think i read somewhere they changed to reporting defects only. So that means railfans won't know trains are coming unless the defect detector alerts on a defect.
Is this true?
Tnx!