| 摘要 |
<p>A railway transportation system comprising a set of loops includes railway systems, tracks, stations and objects running on the tracks, wherein said railway systems are formed by several independent loops including anticlockwise A lines and clockwise C lines, independent adjacent loops of A lines and A lines, or C lines and A lines, or A lines and C lines, as well as a single bidirectional line running either between A lines or between C lines, and which thus constitutes an invisible B line.</p> |
