You really are an idiot, aren't you? There is a whole world outside the Bos-Wash corridor, Simfan. There are none of these "trains" of which you speak in Houston or any other city in these part of the country.
I'm well aware there is actually no train. But perhaps the question you should ask is
why there is no train.
Besides, it's freaking Kansas. Large swathes of this money is going to finance infrastructure where population density is extremely low. It hardly makes sense for people from such places to "take the train".
Then why do they need all these new highways?