it didn't shut down but I do remember being on IASW once in the rain. Remember it is outdoor for part of it, including as you come out of the ride. It was okay until we went under a bridge that spouted water straight into the boat and consequently my rear. Good times. For some more experience on DLR in the rain, check out the trip report board and you'll see the Wettest, the Merriest... TR by dani. She talks about what was fine in the rain and what was a really bad idea.