You get 2 pairs that's 4 gates enough for 1 crossing. The rule is not for sale and is only a guide as to the width.
009 Narrow Gauge Tram Loco on Kato 009/n running gear Runs fine forward&revearse
OO9 009 Narrow Gauge Baguley Drewry Inspired Diesel Body For KATO's 103 / 109
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OO9 / 009 Narrow Gauge "Bong Bong" Logging Loco Body Inc KATO 11-109 Chassis
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009 Narrow Gauge Bundle with Loco Wagons Buildings Ballast and Accessories