Police in the Northern California city of Redding say a man threatened an Amtrak bus driver with a knife and tried to take over the vehicle.
It's not clear whether any passengers were on board at the time.
Police say 43-year-old Robert Fender, of San Francisco, threatened the 58-year-old driver at the Redding bus terminal around 7 p.m. Saturday.
Redding police spokesman Bart Langley says the driver was able to escape and activate a kill switch that disabled the engine.
Police say Fender ran and was arrested nearby.
He was being held Sunday on $100,000 bail on suspicion of assault with a deadly weapon, terrorist threats, carjacking and displaying a weapon in a threatening manner.
It's unknown if Fender has an attorney, and a phone listing for him is disconnected.