Shake,rattle and roll

摘要

In the dusty outskirts of Pueblo, Colo., there's a place where engineers put the North American rail industry's equipment to the ultimate test.rnAt the U.S. Federal Railroad Administration's Transportation Technology Center (TTC) nearly every bolt, bearing, steel weld and digital device used in North American railway suppliers' latest equipment designs is put through a rigorous test before it can be used on the nation's vast rail network.