We've all sat at railroad crossings watching a train go by. I'm always struck by the fact that the graffiti artists are generally careful to avoid painting over logos, reporting marks, and other codes on the cars. It is a dance between the railroad companies and the graffiti painters. One thing I don't think about is how the crossing signals work, I just take them for granted. The above video discusses that, and it is interesting what they have to do to get the whole process to work properly.
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