Sentence:  A “moving platform” scheme...is more technologically ambitious than maglev trains even though it relies on conventional <WSD>rails</WSD>. Local trains would use side-by-side <WSD>rails</WSD> to roll alongside intercity trains and allow passengers to switch trains by stepping through docking bays. 
Meaning of the word marked with <WSD> tags:  The metal bar that makes the track for a railroad.