Tom, I was reading your website and on the page on Trail & Effects it ended with this statement - "Track frames are a whole different thing though. If you would like me to, I can get into that. Let me know."
Tom as I'm searching around for a custom track frame I'd be happy to hear your views on this subject. I've had a few custom frames (road & mtb) made in the past so I'm aware of Trail and its relationship to handling but I've never seen an opinion on how Trail relates to a track frame's handling.
If it makes any difference I ride on the new http://www.forestcityvelodrome.ca/index.html with 50 degree bankings and 138 metre laps and any track frame I would order would be a "general purpose" (meaning I don't race!) version.
I'm editing this post to include this - I instruct two Trackskills sessions per week and it's very apparent that the hardest thing to do on this track is to "hold the black line" in the banking while going flat out. Some people do it much better than others. Does Trail have anything to do with this or is it personal skill related to banking geometry?