I was curious what that seemingly innocuous setting impacted so ran a couple of experiments. So far that setting seems to make no difference. But what does seem to make a difference is saving the CS3 prior to shutting down as opposed to simply shutting down without saving. In each instance the speed settings remained on start-up but when a save was performed before a shutdown the mfx and mm locos both began running as soon as the stop was taken off but with no save performed the speed settings remained on start-up but did not move when the stop was removed. I need to check one more option - the "start locomotives automatically" setting with no save. If there is no change it would have no function.