If your presentation is as good as I've been told, by several who attended it last summer, then it would go over well with the Winterail crowd. As a regular attendee of over 20 years, I believe that, while we foamers like the pretty train pictures, we REALLY like the history of WHAT we're seeing. Shows that inform & educate, whether it is about the Sacramento Northern or Steam in South America, are always well received at Winterail. If the length of your show is problem, ( you've indicated it does not feel like 90 minutes ), a break can always be thrown in.
Yes, Winterail has, for the last 10 years or so, been held the 2nd Saturday in March, at the Scottish Rite Temple with it's great 700 seat theatre. I'm assuming your show is in a digital format, ( they use Pro Show Gold software for most of theirs ); do you perform live narration ??? If so, consider recording a narrative soundtrack. I would prefer live myself, but it's always good to have a back - up plan.
I will talk to Vic Neves about your show; I'm sure he is so busy with the details of this Saturday's gig that he won't see this thread for a few weeks. I suppose he can also get in touch with you through the NP Tech group.