I'm making an adventure map. In one challenge you have to shoot a minecart with a bow and arrow and destroy it in order to open a door. I have the minecart on a loop of powered rails (except for the corners, and a detector block used to determine when the minecart stops going round).
Simple experiments seem to suggest that the cart will keep moving once it's going even if I save/exit and come back, but is this always true? Is there a chance someone playing my map could get to this puzzle and find the minecart stationary?