Fun Fact: roller coasters run faster at night compared to in the morning! This is because as a coaster cycles throughout the day, the lubricant in the wheel bearings warm up and become less viscous, therefore providing less resistance. This means the train loses less speed throughout the ride. Roller coasters also run faster in the heat vs the cold for this same reason! Another factor that influences a coaster speed is the amount of weight on the train. Since a heavier train contains more moment