There is so much going on in Cleveland as far as crime goes they should do a CSI series just for that town be safe when railfanning out there and be aware of where U park your car.
“No Go Zones” are areas that police responce is non-existant or takes a long time to respond. Parts of Chicago, Detroit and Cleveland fall into this realm. Even isolated suburban areas like parts of Columbus OH and Indianapolis can be "No Go Zones"s ee- http://en.wikipedia.org/wiki/No-go_area. Watch yourself around lonley isolated subway stations like most of the South Shore Stations
I lack figures to prove it, of course, but I will bet that PATH is the very safest system largely using underground and elevated stations anywhere in the combined areas of North America and Euopre, although Toronto may also be a contender.
All of the TTC stations are manned when the subway system is operating. I once caught the last train on the Danforth line and it was delayed getting to my stop. They were locking up the station when I arrived and they asked me why I was in the station and I told them that the train was late. No big deal really but at 2 am the streetcar does not stop in the station (Dundas st West) as the front doors are locked (there is nothing to stop you from walking in on the pavement where the buses and streetcars enter as there are no gates) and the 24-hour streetcar picks up at the corner of Bloor and Dundas just outside. The main thing is, there are no “no go” stations in Toronto no matter what the time of day or night. There are the occasional jumpers but crime on the TTC is almost non-existent.