Home › Words › V › vactrainvactrainvactrain means A theoretical maglev running in vacuum tunnels.Among words judged in Lexicurio's Arena, vactrain ranks #16,733 of 42,747 for Qualifying.EtymologyFrom vacuum + train.nounA theoretical maglev running in vacuum tunnels.Definitions & examples from Wiktionary (CC BY-SA 3.0).