CONCEPTS: descend, escalator, mall

GEN: tourists descending on an escalator inside a shopping mall .

CONCEPTS: exit, location, road

GEN: location will open at the exit on road .

CONCEPTS: come, track, train

GEN: A train is coming along on a track.

CONCEPTS: passenger, railroad, train

GEN:
The train has stopped at the railroad for passengers to get on and off.