It is well documented that women often face sexual harassment and violence during their daily commutes, particularly in countries with extreme levels of gender inequality. A popular reaction to this problem is to issue women-only transit services. Despite this growing trend, we know very little about it. Looking at the case of Mexico City, this study examines, analyzes, and evaluates women-only transportation, focusing on the roles of culture and public opinion. Drawing from both qualitative and quantitative data, it finds that the violence women face in public transit leads them to always opt for women-only services, encouraging local policy makers to increase their numbers. Local feminist groups have advanced this system by arguing that violence in regular public transit is gender discrimination. Consequently, they have positioned themselves as administrators of women-only transportation, using it as a campaign to defend women’s equal right to urban mobility.