In the mid-nineteenth century, work began on a crucial section of the railway line connecting Boston to the Hudson River. The addition would run from Greenfield, Massachusetts, to Troy, New York, and it required tunnelling through Hoosac Mountain, a massive impediment, nearly five miles thick, that blocked passage between the Deerfield Valley and a tributary of the Hudson.
via Malcolm Gladwell: Albert O. Hirschman and the Power of Failure : The New Yorker.
