... cost question. In Western economies, if it makes sense to lay the tracks, it generally makes financial sense to put up the trolley wire as well, though because of controversy over trolley wire in some locations, there is also research into contact-free electric supply via induction.

Regular city buses are a more natural target for a fuel such a biomethane, since they do not require the establishment of a filling station network, but can be fueled from a central depot, and their role is to complement the dedicated transport corridor network.


I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.