Posted by alex swain on December 14, 2010 
"Rusty rail" rule?
Posted by on December 15, 2010 
My guess is they have to expect crossing to not be in proper working order if a rail line hasn't been used for a while.
Posted by Greg Primrose on December 15, 2010 
Rusty rail conditions occur when there isn't enough train traffic to remove the rust from the rails and ensure proper connectivity for the crossing protection system to detect the train.
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