Kadee Part Number: 321 Scale / Type: HO / OO Scales Our Code: KDE321 Permanent Magnet Between Rails delayed-action Code 100 Place this handy "delayed-action" Uncoupler anywhere on a straight track segment between-the-rails. Ready to mount on top of ties with Code 100 rail. Cut out ties if mounting Code 83, 70, 55 or 40 rail. 1pr. Track not included Use the #334 Uncoupler Gluing Jig to aid in the precision installation of #312, #321 & #322 Uncouplers in track.