Expo station is unique from others in that it has no pillar on
the platform, the pillar to support the roof is at the outer side
next to the track. There's also a round roof which looks sort of a
spaceship.
Changi Airport station has a walkway between terminal 2 and the
future terminal 3, the walkway is just halfway above the platform.
Also, no pillar on the platform too, they are just in-line with the
platform doors.
