This question by MP Lee Bee Wah has been circulating online and people are making rude and mean jokes about her.
I think it is a very valid question.
Firstly, this is helping SMRT to improve.
Secondly, in the event of a train breakdown, at least people will be less pissed off when they are in the shade. Imagine if the train breakdown and we have to wait in the hot sun. Lagi angry right.