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Upgrade tracks to allow for trains to travel faster than cars, increase commuter rail presence especially in major metro areas, but most importantly: Electrify everything.
>Lighter trains result in faster acceleration and less required energy
>Trains are less bulky and ugly looking than diesel locomotives
>They cost less to maintain, allowing for much more frequent service
>They obviously run on electricity, which means they'll work well as a green alternative to road transport (especially if the country switches to renewable energy, though I'm not counting on that)