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Block and crossing signal detection systems
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<span class="smiley">[#welcome] I use the photoeclectric method for my crossing signals, it wouldn't work for block signals, but I have encountered no interference. I actually made the circuit myself, it was VERY cheap, less than the crossing signals themselves. I got everything I needed for the circuit from Radioshack. Just my </span><span class="smiley">[2c]</span>
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