Sentence:  A “moving platform” scheme...is more technologically ambitious than maglev trains even though it relies on conventional rails. Local trains would use side-by-side rails to roll alongside intercity trains and allow passengers to switch trains by stepping through docking bays. ... This would also let high-speed trains skirt cities as moving platforms <WSD>ferry</WSD> passengers to and from the city centre. 
Meaning of the word marked with <WSD> tags:  To move someone or something from one place to another, usually repeatedly.