Sentence:  A “moving platform” <WSD>scheme</WSD>...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 set-up solves several problems [...]. 
Meaning of the word marked with <WSD> tags:  A systematic plan of future action.