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I've done some calculations based on the main London-Bristol line in the UK that runs close to where I live. Based on a 500 seat train passing every 5 minutes during the peak, that's 6000 passengers per hour*. Compare this with cars traveling at 100km/h, each 10m apart carrying 1 passenger, that's 10000 passengers per hour. (*My guess for the train seems to be more or less in line with the offical UK stats at http://assets.dft.gov.uk/statistics/releases/rail-passenger-numbers-and-crowding-on-weekdays-2011/rail-passengers-crowding-2011.pdf that show's approx 5000 passengers per hour at Bristol, of which my main line is only one of 4 routes into the city)
As for the power, suffice to say that if the politicians can sort out the renewables then that won't be an issue.
It seems to me that a better way to solve the graffiti problem is to do away with the trains altogether. Rip up the rails and their place lay down some nice smooth tarmac/asphalt. Then run self driving vehicles along these lines. I wouldn't trust a self driving car on a road where most of the other cars have a nut behind the wheel, but if all the other vehicles on the "road" were all driven by computers talking to one and other, then I'd be more than happy. And once I get to my "station" the system would direct my car to an exit siding. Once there I would engage the manual driving mode of my pod, and take it home - where hopefully it won't get spayed with some gangster man's tag.