How much of the increased rail use is helping increase GDP, though, rather than being purely leisurely trips with little long term value for the economy? More people going to hike in the forest on the weekend technically increases GDP but doesn't add much value to the economy overall.
Keep in mind there’s only about 50 miles of high-speed rail in the U.S. so far. With major cities like Dallas and Houston or San Francisco and LA still unconnected by fast rail, there's significant room to boost GDP and improve lives. Expanding rail isn't just about GDP growth, it's about enhancing daily living and connecting communities more effectively. As RFK famously noted, GDP measures everything ‘except that which makes life worthwhile’. Rail development does both, supporting the economy and enriching our lives.
Almost nobody will take that train daily, and it is stupid to think anyone would or should. However it is reasonable to expect the train will be crowded from all the people who take it less often. Companies send their people to other cities often for various business reasons. People take several vacations per year. Nobody is doing this daily - but the sum total of weekly, monthly, yearly, and once in a lifetime trips add up to a lot of people very day.
If I could take a train instead of a plane, I would. Doubly so if it saved me money. Savings for individuals means more money to spend on other things.
For many it helps cover the gigantic rent hikes. Many workers need public transportation to commute because they can’t afford a car, which keep becoming more expensive because cheap cars don’t make profits. It was not rare before for public transport subs to cost upwards of 100 EUR