[CydeWeys]

They've solved the boarding/debarking issue by having variable speeds, but maintenance still seems like it's going to be a huge problem. Escalators/moving walkways are always having maintenance problems. It's a simple result of how many moving parts and rubbing surfaces are involved. Think of a car moving on a road -- you've got four tires and two spinning axles. You can easily go many tens of thousands of kilometers without needing any servicing, and when you do finally need servicing, it's just a quick tire replacement. Fixing walkways/escalators isn't nearly so simple, and if there's any problem, it takes down the entire span.