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Trains run on rails, which doesn't exactly allow them to go off-highway. If you're already spending a fortune on building the rail infrastructure, why wouldn't

• bombcar 1y ago
  Because in most places in the world, the rail is already built. So it's either extend the existing rail network, or try to build a new one entirely. (Apparently it's something on the line of $10m/mile to add electrification, so presumably building it while building out is less, but not much less.)