find a way to keep people safe when waiting for subway rides.

To create a armored wall that can withstand anything, such as: bullets, chairs, and etc.
The cost of the wall may be expensive to build, but it would be a good way to keep people safe when waiting for a subway.
It would be a subway powered wall, that when the subway pulls up and the subway doors open, it allows the doors of the wall to open, like a magnetic or electric connection. The door walls cannot be opened manually only by subway.
It would be a clear, thick glass wall.
It would stop the pushing of people over onto the railways, it would stop subway suicides, and it would make people feel safer about waiting. It would make a safer commute.