Those look like the type of windows Continental Trailways Eagle buses had from the '50's until the early '70's. The upper part of the window was able to open inward, and powerful spring latches kept them in place either closed or opened. When closed, their seals did a good job making them air-tight. Their design also prevented rainwater from coming in. They were a blessing whenever there was an air conditioner failure. I can't see any safety issue from having them. The only problem might be loss of air conditioning if opened, but in a private room sleeper, that would mainly be the choice of the occupants.