The Train at Kings Island only runs 1 Train most of the time (switching them out to work on the other)
The only times you will see 2 trains are (if both trains are working):
a) Saturdays of June/July (Some years they have and some they havent)
2 mini "baby" trains for October for Pumpkin patch and Halloween Haunt
c) Any day KI feels the crowd will be massive (Which the day of the K. jump they wanted to have 2 trains, but as Posted earlier one of the trains is being worked on)