I first thought all those aligned bridges were following the course of rivers. But it seems that most of them just cross over railways! Compare: https://www.was

I first thought all those aligned bridges were following the course of rivers. But it seems that most of them just cross over railways! Compare: https://www.washingtonpost.com/graphics/national/maps-of-american-infrastrucure/img/bridges-1480.jpg?c=400 https://www.washingtonpost.com/graphics/national/maps-of-ame... (bridges) and https://www.washingtonpost.com/graphics/national/maps-of-american-infrastrucure/img/rails-1480.jpg?c=348 https://www.washingtonpost.com/graphics/national/maps-of-ame... (railways).