What triggers the lights/bell/crossing gate when a train approaches
the crossing? How come when the BNSF approaches the crossing at 80th
and Sheridan, NW of Denver, it triggers the crossing a quarter mile
before it gets there--even a coal train chugging at 5 mph. But, once
it passes, the gate goes up almost instantly after the train is
thru? Sometimes a southbound pulls right up to the crossing and then
stops. After he gets stopped, somebody does something to let the
gate back up while the train just sits there. How do they make the
gate go back up when the train is parked just a few feet from the
crossing?
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