Why does the handrail on an escalator always go faster than the stairs?
There are several possible reasons why the handrail on an escalator may move at a different speed than the stairs.
One reason is that the handrail is made of a rubber ring that stretches and wears out over time due to friction, making it slightly longer and slower than the stairs².
Another reason is that the handrail is designed to move faster when going up and slower when going down to help people keep their balance and prevent them from falling⁴.
A third reason is that the handrail has a tolerance of 0 to 2% relative to the nominal speed of the stairs, which means it can vary slightly depending on the load and temperature³.
These are some of the factors that affect the speed of the handrail on an escalator.