@gunrunnerjohn posted:I like the S1, but I was a bit disappointed they didn't include whistle steam in those. I'm not nearly as enamored by the safety valve steam feature.
Well, like Ryan said the S1 did not have a whistle but instead a horn. Instead of just getting a horn, Lionel decided to go ahead and put a whistle in it. Also, Ryan said that there was nowhere to put a whistle or even the system for the effect so they substituted it with the safety vale effect.