The magnetic levitation train is a very long asynchronous linear motor intended for transportation of fragile cargo and people. A conductive train is accelerated by a quickly changing magnetic field produced by stationary coils. Power supply requirements are less demanding than those of a short coilgun. The minimum mass is 106 tons.
Makoto Nagatomo and Yoshihiro Kyotani, "Feasibility Study on Linear-Motor-Assisted Take-Off (LMATO) of Winged Launch Vehicle," Acta Astronautica, Vol. 15, No. 11, 1987, pp. 851-857.
William B. Scott, "Consortium Studies 'Maglifter' Concept," Aviation Week and Space Technology, Vol. 142, No. 25, June 19 1995, p. 69.
Article in Popular Mechanics, October 1995.