A window assembly for a public transportation vehicle that permits rapid removal and replacement is disclosed. The vehicle has a sidewall with a window opening. One or more frame members are attached within the window opening. The frame members are adapted to comprise one or more apertures. One or more retainers are adhesively attached to the inner surface and towards the outer periphery of a piece of glazing. The retainers have protrusions that can extend through the apertures in the frame members and engage therewith when the piece of glazing is positioned adjacent to the window opening. Removable fasteners can be attached to the protrusions so as to detachably secure the piece of glazing and the retainers to the frame members. This allows easy removal and replacement of the piece of glazing from the window opening of the sidewall of the vehicle.