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Here's a view of one of the single IR-LED
towers located on the same Louisiana Central staging track seen in
the previous photo. If you look closely, you can see the top
of the photo-transistor between two ties (the small blue
dome). When a piece of rolling stock rolls below the tower,
the light beam seen by the photo-transistor is broken, and an LED
will illuminate on a panel located on the fascia nearby.
Depending on the track and location, there are either two or three
sensors near the end of a given track so the engineer knows when he
must slow, then stop. |
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