A powered roller coaster is a railed amusement ride similar to a standard roller coaster. Unlike a true roller coaster, the train is powered through the entire course, rather than being allowed to coast after an initial lift or launch. This allows for both compact layouts that start out with curving hills, or long, extended layouts that would need too many lifts to be feasible. The most common manufacturers of powered coasters are Mack, Wisdom Rides, and Zamperla. Due to the family-oriented nature of the rides, height restrictions can be as little as 36 inches or taller for someone to ride.