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Automatic release using a magnetic coupler and neodymium magnet. N Scale Magnetic Uncoupler on Neodymium magnet HIQPARTS Neodymium magnet N52 square 4mm x 4mm x height 1mm (10 pieces) https://www.hiqparts.com/category/4/4... KATO Magnetic coupler No. 2001 11-712 https://www.amazon.co.jp/KATO-%E3%83%... All rails use PECO Code55. Railway model N gauge diorama layout N-Scale RAILROAD LAYOUT CROSSING and SIGNAL,CONTROL PANEL TOMIX KATO GREENMAX MICROACE