That means that the supports holding up the track can be much smaller & cheaper than those needed to hold up a train of several railcars full of people. Think of the pictures you've seen of a monorail, with the small supporting columns for a long stretch of track.
Tim Bonham, Ward 12, Standish-Ericsson
Why does it cost less than an elevated train? My guess would be that it's because the rolling stock is privately owned. That makes it _more_ expensive overall because it's cheaper to build vehicles that hold many people than vehicles that only hold a few. -Dave
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