But American cities are not the first movers. A full decade ago, the Estonian capital of Tallinn invited its 426,000 residents to use buses, trains, and trams without paying a cent. [Photo: Ilja ...

For many, free public transport sounds like a kind of utopian dream. Hop on a bus, tram or train – or all three – and it costs you nothing at all. Zilch. Nada. The idea, generally, is that it’s ...