People are on an escalator waiting to get to their destination while looking outside of the glass that makes up the wall.
The people are going up on the escalator.
Waiting to get to their destination does not necessarily imply that they are going up.
Just because  people are on an escalator waiting to get to their destination while looking outside of the glass that makes up the wall doesn't mean the people are going up on the escalator.
Not everyone is going up on the escalator.