Each track has its own sensor looking down on the track to detect the trainEach track also has an input for external controlJumper selectable short (4 or 10 second) delays b/w stop/caution and caution/clear or goStrong ABS plastic constructionStainless steel ladderFully assembled and testedAs always: just set it & connect it - your done!Can be upgraded with additional tracks and/or signal heads.
