A retaining system for a mass-transit vehicle adapted to travel on a guideway includes a longitudinal retaining track having two retaining rails. Each retaining rail has a projection projecting inwardly toward the other retaining rail. A grabbing mechanism of the mass-transit vehicle has grabbing portions extending outwardly underneath the projections of the retaining rails. The grabbing portions are pivotally and resiliently connected to a wheelset of the mass-transit vehicle proximate a midplane of the body. When the mass-transit vehicle rolls on one side past a predetermined angle, an opposite one of the grabbing portions is operative to contact a corresponding one of the horizontal projections. The roll of the mass-transit vehicle is thereby gradually stopped under a force developed by a corresponding resilient element.