After the PT KCJ bought more train set from Japan, you can see some train with the poles. I just think that the pole can be use as tool to dance inside the train car.
Although I never see people here dancing inside the CommuterLine train car, but I think it is a good idea if someone out there willing to try to dance using the pole
Here are some example video of people dancing and use the pole inside the train car. We should have this kind of stuff in Jakarta 😀