It seems that this item was previously available for "N" scale layouts, but now it's available for "HO" scale model railroad layouts. This is a simple way to add a functioning block signal to your layout. You would power this up from a Kato power pack or another source of power. It remains green until some metal wheels trip the sensor by passing over the segment track with the sensor. You will need to have your rolling stock with all metal wheels to have this product works more life like because the block signal works on a timer from the time the last metal wheel passes the trip switch. Also, this is not recommended for those who would want a block signal to indicate red if a train is on an upcoming block because this product will time back to yellow, then green after the last metal wheels passes the trip plate. You may have to make modifications if not using Kato Unitrack, which I am not using, but I was able to incorporate this in my layout with a few modifications. But this item is very simple to connect and works easily. So if you want a simple functioning block signal on your layout, this is it!Read full review
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