You mean it's so that people don't have to walk two meters from one elevator to another. What a waste of energy lifting that extra hunk of metal.,(reply>), +Joseph Davies It IS timed with the other. The elevator starts when it wants, there are no buttons. They have to move together,(reply>), +phsopher: It's a good point.  Why not just take people to the end of the tunnel and let them take a separate elevator?  The return trip could start already, increasing overall passenger capacity too (unless it's already <i>perfectly</i> timed with the other car he mentioned).