On a traditional or old fashioned roller coaster how was the speed generated?

On traditional or old-fashioned Roller Coasters, speed is primarily generated by gravity. The ride typically begins with a lift hill, where a chain mechanism pulls the train to the top of a steep incline. Once at the peak, the train descends, converting potential energy into kinetic energy, which propels it forward. The design of the track, including drops and turns, further enhances the thrill and speed of the ride.