[masonic]

Light rail is the worst of both worlds: the slowness of a bus with the route inflexibility and capital expense of rail.

Silicon Valley's VTA Light Rail has the worst rate of return of any transit agency in the country, if not the world.

[tim333]

The Docklands Light Railway has worked quite well. It gets you from A to B much quicker than a bus although the top speed is not high, by avoiding jams etc. It's also driverless unlike the busses.

[masonic]

The parent comment referred specifically to North America. No doubt London is quite different.