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If overhead wires were the only advantage of light rail, why is anyone using light rail instead of trolleybuses?

The answer is of course that rails provide major advantages on their own, primarily by allowing vehicles to travel much more efficiently thanks to the low friction of running steel wheels on steel tracks

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They also provide major disadvantages, like a single obstacle or broken down vehicle blocking the entire route.

BEVs will become more popular (in my prediction) because they are simpler than diesel, and are self-contained unlike electric trains that depend on external wire systems working, so they will be more reliable.

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