Talk:Station/@comment-2605:A601:9CB:D400:E5A7:DF4E:58:D0C-20180823081257/@comment-2605:A601:9CB:D400:E5A7:DF4E:58:D0C-20180823081944
In other words, does the 4 kilometers represent the from the outside of the whell to the center (radius), from one side of the wheel to the other (diameter) or all the way around the wheel (cercumference).