<human>:  Can Amtrak's Acela Express break the sound barrier?
<bot>: No, Amtrak's Acela Express can not break the sound barrier. Amtrak's Acela Express is the fastest train in the Western Hemisphere and can reach 150 mph. A US Navy plane would need to travel 770 mph to break the sound barrier. So Amtrak's Acela Express can not break the sound barrier. So Amtrak's Acela Express can not break.