Abstract: Disclosed is a glazing system for a passenger service vehicle, as well as a passenger service vehicle comprising such a glazing system. The system generally comprises glazing frames that are attached to a passenger service vehicle, which have glazing mounts extending inwardly along some or all of the frames. The mounts are configured to associate a glazing panel with the frame. Further, there is disclosed a removable retainer configured to engage with the frame, and to retain a glazing panel against the glazing mount. In some examples, the frame comprises a frame retainer and the removable retainer is configured to engage between the frame retainer and a glazing panel in an interference manner in order to retain, or urge and retain, a glazing panel against the glazing mount. During repair, or maintenance, the retainer can be removed to allow for ease of replacement or repair of the glazing panel.