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What makes it hilarious?

I guess that the US doesn't even have electrified rail yet. This has been standard all over Europe for many decades now. It's really low hanging fruit, that the US apparently never bothered with.

So the US is going to end with diesel trains vs electric trucks. The complete opposite of the situation in most of the rest of the world.

No, the hilarious part is how the author thinks it's trivial to replace all existing railways that diesel trains use with electrified ones.

That's an immense infrastructure project that is almost certainly not financially worth it.

Depends on power transmission efficiency.

It depends primarily on how much they're used. Trains are used a lot in western Europe, which makes electrification very much worth it. But if you only get one train per day, it's probably better to stick to diesel.

No. It depends on how much it costs to erect thousands upon thousands of miles of transmission lines.

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