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Parry People Movers
Secondly, the issue for the foreseeable future is with heat losses from the carbon-fuelled power which provides the electricity.
It surprises me that burning gas in a power station to provide and distribute electricity to power electric trams is more energy efficient than gas-powered internal combustion trams would be. Do you have a source for that?
Thirdly, I wasn't suggesting bio-gas could replace conventional fuels on all conventional transport.
I was merely thinking that there is a role for simple solutions which can be rapidly implemented without vast cost and complexity.
I suggest that a new generation of really light street-cars/trams/whatever running on suitable track might be a good way of rolling out public transport rapidly, particularly in countries like Venezuela, Nigeria, and Iran who waste energy - and particularly gas - on a massive scale.
I don't see this as an alternative to heavy metro, merely as a complementary solution, since such ULR vehicles could presumably run over existing tram tracks as well as their own.
Finally, I think that in a 'for profit' and increasingly risk averse world simple and lightweight solutions are rarely put forward, or taken seriously when they are.
There's not much profit in either the vehicles or the supporting infrastructure.
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