"An indoor space with police supervision". The transit police in Newark are not there to supervise the homeless. Rather it is because of the homeless that we have increased transit police. It's for the safety of the genuine passengers. Technically, if you have a valid ticket or you intend to get one they cant get rid of you unless you commit a crime.

The way I see it there is no solution unless you discriminate against people based on looks. Either that or blocking access only to people with a valid ticket for that day but that also means changing the PATH ticketing system.