Why do buses and trains not have seatbelts?

Why do buses and trains not have seatbelts?

Bus and train accidents are not in the news very often. They are more rare than accidents involving passenger cars. But when these kinds of accidents do happen, they can be completely devastating. One of the reasons for that devastation is the lack of standard safety features that are commonly seen in cars and planes. These features include seat belts in both planes and cars, and the smaller windows and latching, overhead storage bins that are found in airplanes. Why…