This snow plow is compatible with Thomas the train (and other engines) for Thomas the Train wooden track engines. Buy a magnet here:
https://www.leevalley.com/en-us/shop/hardware/rare-earth-magnets/magnets/ball/45088-rare-earth-spherical-and-hemispherical-magnets?item=99K3851
Choose - 1/2" Hemispherical - as the style option
insert it into the magnet slot and you are good to go!