offspring use : transport using strong tethers (Score 1)

Here in russia there is one intresting idea since 1977 ( so seems patent free already ) to build a transport using 'strings' see demo pictures here http://www.unitsky.ru/ . Now, using strong tethers developed for space elevator instead of steel strings in the mentioned design, one gets quite a cheap transport solution - less construction costs than for railroads with the same energy to deliver the cargo.