Jose Garzon Amo, the driver of a train that derailed in Spain on Wednesday killing at least 78 people, is being held at a police station on suspicion of negligent homicide, the country's interior minister said Saturday. Amo was minorly injured in the accident and was in the hospital under police surveillance until he checked out Saturday. He was taken to a police station immediately upon being discharged. Openly obsessed with speeding, Amo was allegedly driving twice the speed limit around a tight curve Wednesday when his eight-carriage train derailed and smashed into a nearby wall. Although he has refused to answer questions, a judge is expected to interview him on Sunday.