Trains are just the most efficient way of moving people between cities. They benefit everyone, even people with cars.
You have a business trip and need to go from A to B by yourself? Take a train, it frees your brain and the highway for people traveling in groups or with lots of luggage.
Incidentally it also avoids moving 2 tonnes of material for no reason.
A passenger train in the USA weighs about 1000 tons, plus another 150 or so tons of locomotive, before we add the passengers (seating 80 per car and about 11 cars for 880 passengers).
You have a business trip and need to go from A to B by yourself? Take a train, it frees your brain and the highway for people traveling in groups or with lots of luggage.
Incidentally it also avoids moving 2 tonnes of material for no reason.