Are they feasible in this scale, in either DC or DCC? Does anyone have working examples? Thanks in advance.
This article by Fast Tracks exists on the web and they have been built in larger scales. I haven't heard of any being commercially available. http://www.handlaidtrack.com/assets/downloads/ug20.pdf
I don't see any reason that they can't be made to work in N scale. The issue will be alignment of the stub rails for the 2 (or more) paths, because there are no point rails that can be pushed against stock rails to force alignment. But, if activated with servos, I would think they could be aligned accurately enough. If not, then some sort of mechanical stop would have to be made that works from some out-of-sight position, which might be tough to do.
I certainly wouldn't do it. Just as soon as you offer a product to the public, you get people expecting the same sort of reliability of performance you get from a standard turnout. No stub switch will ever be able to pull that off. You'd just be begging for unsatisfied customers.
HOn3 modelers make stub turnouts all the time. I would use code 55 or code 40 in N scale. Making these turnouts was a lot of fun, I did some for my civil engineering certificate in the NMRA Master Model Railroader program. They would look best on a short line from the late 1800's to the mid 1930's unless you are doing something like the East Broad Top in standard N gauge. Good luck and let us know what your results were.