Originally Posted by WHBM
Strange when bags with wheels weigh typically 10-20 kg, whereas people standing on each step of an escalator weigh typically 50-100 kg.
It's not a matter of weight, but of centre of gravity and stability. A person can stand on an escalator stair without difficulty, whereas many large suitcases I have seen being taken on escalators extend well beyond the edge of the stair and have to be held constantly to prevent them toppling over. But that should really be obvious to even the grumpiest, most reactionary PPruner (who would undoubtedly be moaning on this very forum if someone else's oversize luggage toppled onto them on an escalator).