Dapols' Easi-shunt knuckle couplers are designed to clip into the N gauge NEM mounting fitted to many current and most new release N gauge models.
The knuckles are magnetically activated using in-track magnets with poles placed alongside each rail to attract the steel operating pins, opening the spung knuckle and shifting the coupler head to one side. While stopped over the magnet an uncoupled wagon will not recouple, instead the offset knuckles will engage in a delay position, the fixed arm part of the knuckle head preventing the knuckles from closing together. An uncoupled vehicle can then be propelled beyond the magnet and left in a siding. The couplers will not re-engage as the locomotive draws away, but will reset so they will couple when the next vehicle is pushed up to it.