The Loop is a structure of iron and railways, it is a raised train which connects the city by way of a 'loop'. You have probably seen it in the many movies filmed in Chicago, e.g. "What Women Want" in which the protagonist could hear what women were thinking in a passing train .... . In this as in so many others have seen the famous train .... The train has a lot of real local pride, it was built in 1880 and still runs excellently. No line runs fully in a circular flow, as was the initial purpose, all round and then go off. It's best to take the train in reverse order to walk at least for a while on these roads that go up to the first floor of buildings.