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iTrain Tutorial Series - detection
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Train Detection can be divided into three broad categories by location accuracy:
Block detection - whether a train is located somewhere on a particular section of track, or block.
Location detection - whether a train is located at a specific point on the layout.
Proximity detection - whether a train is located at or near a point on the layout.
Conductive Detection
Many references can be found to various designs for conductive detection, by the detection of any current being consumed on the track block as an indication that the block is occupied. This is the most common form of block detection used on DCC layouts.