In article .com, Mr
Thant writes
Sorry, this is bonkers. The handrail is driven by a separate set of
drums so can run at any speed.

I understood that the speed was made slightly greater so that people who
hold on to the handrail don't fall backwards. If it was slightly less
(and it's hard to make it *exactly* the same) people might unbalance
themselves before they realize what's happening - leaning forwards is
more obvious and easier to correct in time.

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