It's because 15 million people don't have adequate service to move around, which is detrimental to the economy. The team took the train today and it took a very long time, so we're using other options. We're still using our personal cars or we're taking the plane which, in the 21st century, is probably not the right way to go.
I made the joke to someone else before that trains are like sausages. The more we build them, the more they will be used. That's exactly what is happening everywhere in the world for climate purposes. However, for economic purposes, that corridor between three capitals—two of the largest cities—does not have an adequate train service, which is desperately needed.
I think the law of gravity is there to justify it.