Basically, they have just drawn out the on the floor and seat on places that you should stand and sit. Maybe picture will explain it better
Image via Singapore Atrium Sale
Image via Singapore Atrium Sale
Image via Singapore Atrium Sale
Image via Singapore Atrium Sale
Image via Singapore Atrium Sale
So big kudos for implementing this. It’s a good way to remind all the commuter user that they need to practice social distance in train.