Roller Coaster Ride (night of 10/07/2015)

I suddenly realize that I am not on a train leading to a station - or perhaps some kind of tourist destination. I realize I am on a roller coaster ride. I look about in terror. The roller coaster - there seems to be no-one else on it - is ascending through a corridor. we are going up high. Soon, I think, I shall be flung about this way and that at high speeds, and there is nothing I can do.