An automated, 3-1/4-mile, steel wheel on steel rail rapid transit system, designed and built to serve visitors to the 1967 World Exhibition in Montreal, is described. Each of the eight trains consists of six 75-ft-long lightweight, air-conditioned cars. The double track line has five stations and a complete maintenance and yard facility. System capacity is 30,000 passengers per hr in each direction. An unusual method of supporting the continuous welded rail to dampen vibrations, is described. The problem of attenuating noise is considered, and among the methods implemented are an acoustic fence and viscoelastic compound applied to car wheels.