Transit Tube: Science Fiction

The hang-up caught her in a transit tube. Lights flashed red, the alarm blared, and an automated voice ordered all people to find a handhold or exit the tubes as soon as possible. She'd considered the faint possibility that that would be their response, of course, but the notion of actually just....shutting down...the tubes gave her the chills. With a response like that, a willingness to doubtless kill dozens of innocent civilians, how could she even dream of fighting it? She tightened her hand around the briefcase she carried. All that ran through her mind in the space of a heartbeat, as she launched herself for the nearest exit from the tube. It wasn't what one would call a good part of the station, but--

Inspiration: Computer hang-up.
Story Potential: Low
Notes: This is all interesting, but is, itself, not a good enough story spark.