Abstract: This disclosure relates to a structure for mounting and interconnecting adjacent windows in a railway passenger vehicle. Windows are mounted in resilient sealing gaskets which are held with a locking clamp that is mounted in a wall attached, resilient seal member. Interconnecting the interior adjacent windows is a framing member having an inside, peripheral end that fits within the locking clamp encircling the windows and has an outside periphery held in place by a rigid, plastic, snap-on sealing mask which interconnects the outside edges and holds each securely in place between the adjacent windows.