MegaStructures - Season 6 - Eps 4: Train Wreck
Railroads are the backbone of American industry. 170,000 miles of track crisscross the country from coast to coast, moving two quadrillion tons of freight every year. But nothing lasts forever, and that includes a couple of 180-ton locomotives. Their engine technology is inefficient so they're headed for the scrap dealer where they'll be cut down and cannibalised. Any salvageable parts must come out intact for resale, while any leftover metals – like steel and copper – will be cut up, melted down and ultimately reformed into new products. In this business, nothing goes to waste. Take an inside look at the unknown world of scrap, where locomotives go to die and be reborn
About MegaStructures

Title: MegaStructures
First Air Date: 2004-01-01
Last Air Date: 2012-05-24
Status: Ended
Rating: 7/10 (from 18 votes)
Language: EN
Seasons: 10
Total Episodes: 159
Network: National Geographic
Genres: Documentary
Production Companies: National Geographic
Synopsis
MegaStructures is a documentary television series appearing on the National Geographic Channel in the United States and the United Kingdom, Channel 5 in the United Kingdom, France 5 in France, and 7mate in Australia. Each episode is an educational look of varying depth into the construction, operation, and staffing of various structures or construction projects, but not ordinary construction products. Generally containing interviews with designers and project managers, it presents the problems of construction and the methodology or techniques used to overcome obstacles. In some cases this involved the development of new materials or products that are now in general use within the construction industry. MegaStructures focuses on constructions that are extreme; in the sense that they are the biggest, tallest, longest, or deepest in the world. Alternatively, a project may appear if it had an element of novelty or are a world first. This type of project is known as a Megaproject.