ultra light rail

Etymology
Said to be an improvement on light rail technology.

Noun

 * 1) A small single-railcar on-demand rail system with trunk-separated stations that does not operate on any fixed route but rather to stations where it has been requested, similar to an elevator.
 * 2) * 1992, The Architects' Journal, Volume 196, link
 * His solution was ultra-light-rail
 * 1) * 2005, Institution of Civil Engineers (Great Britain), Proceedings of the Institution of Civil Engineers: Civil engineering: Issues 1-3, link
 * At the same time various proposals for the use of innovative modes such as personal rapid transit or ultra-light rail have failed to progress much beyond concept design or demonstration projects.

Translations

 * French: train ultraléger, tram ultraléger
 * Spanish: tren ultraligero