lego train magnetic coupler,royaltechsystems.co.in
BrickLink - Part 737ac04 : LEGO Plate, Modified 2 x 4 with Train Coupler Open for Magnet with Blue Magnet Coupling, Train - 8mm Cylinder (737a / x547a) [Plate, Modified] - BrickLink Reference Catalog
New 3rd party magnetic train couplers [and micromotors too] - LEGO Train Tech - Eurobricks Forums
5066 Magnetic Train Coupler | Brickipedia | Fandom
ANNOUNCING Knuckle Couplers for LEGO® Trains! | Brick Model Railroader