Bart Rolls out Upgraded Quake Alert System

Mathias Hoffmann of the German Research Centre for Geosciences (GFZ) - Helmholtz Centre Potsdam monitors screens of their own developed GEOFON software, an earthquake alert system in Potsdam, Germany on Jan. 13, 2010. Andreas Rentz/Getty Images

During a 15-minute span this morning on BART, passengers were witness to the rollout of an upgraded earthquake early warning system.

Between 11 and 11:15 a.m., trains slowed to 27 mph to demonstrate how the ShakeAlert 2.0 system would work.