- supported above and below the terrain (ground) with open space between them. In essence, adjusting the segment elevation like a layered cake as segments pass above...1,014 bytes (4,902 words) - 18:27, 19 October 2015
- supported above and below the terrain (ground) with open space between them. In essence, adjusting the segment elevation like a layered cake as segments pass above...18 KB (2,162 words) - 20:10, 24 December 2018