all women" service. This service sees a couple of carriages set aside exclusively for women to travel in. These carriages have security guards who are presumably policing who enters the relevant carriages.
This is not such a bad idea. It is not such a bad idea because recently Jakartan public transportation system has been subject to a number of sexual assaults. These have taken the form of men groping women and in some cases getting their hands inside shirts and down skirts. This has been attributed to men finding themselves in close proximity to women and not being able to control their urges to touch what is not theirs.