I’ve seen several headlines about two Delta Airlines employees ambushed by a gang of teens while riding Atlanta’s commuter rail.
Borepatch, an expert in computer security, sees the incident in those terms:
Security types call this a "Resource Poisoning" attack, where something that was previously valued and trusted becomes worthless because of abuse.
Crime need not be actualized for resource poisoning to occur. If the environment feels unsafe, people choose not to take the trip.
The Hiawatha Line in the Twin Cities has certainly not been crime-free. But since transit authorities use ridership as their measure of success, there’s a disincentive against making problems widely known. Alerts may be posted at stations, but the general voting public only hears how wonderful the system is working.