There probably isn’t one that’s been published, but it would be easy to lay one out for yourself. Bachmann has announced an N scale 44-tonner, so you’ll even have the perfect motive power available soon.
If you do plan to do your own track plan version, I’d suggest that you open things up a bit to allow longer runarounds and sidings and a bit of staging, if you can. The G version is very, very tight and a little more relative length in these areas will make the layout much more fun in the long run.
Plans are usually drawn only to one scale, there likely is no N scale version and never was or will be.
Take the G gauge version and rescale it yourself, it doesnt have to be exact, use the G layout as a planning reference and then use N gauge templates to relay the track plan to that scale on grid paper, from there you can start building. Its not that tough to do, really.
I think you have to join to get access to their files, but it is free. A person with the screen-name Shortliner created it. It is in their file section in a folder named “Shortliner’s folder”.
Not sure if you ever found the Model Railroader magazine series but you should also look up the issues of Railroad Model Craftsman magazine. They published an excellent three page article on the line back in the mid-1990’s. I am at the office right now but will look up the issues when I get home.
Try the August 2005 Model Railroader magazine for part 1. Part 2 is in the September 2005 issue beginning on page 70. Part 2 does not have an illustrated track plan.
IMHO the plan of the town, not the layout by Tony Koester, should be your starting point. It always is great when such a plan is provided, “of course” Tony made sure it was incorporated in the article.
The F (or 7)-like footprint measures 18’ 6" x 10 '6" in Tony’s G-scale plan; not really small. It was build rather low as well, maybe intended for his grandchild’s. (“smallchild’s” in Dutch, maybe a more appropriate name)
When the extension to Coy paper is build the size of the plan will be about 18’6" x 15. Your first decision probably would be finalising the dimensions of your N-scale version.
BTW on Tony’s plan the huge Claremont Paper Co factory is between the operator and the runaround. Just where a lot of (UN)coupling and setting switches is going on. When this large building is built without a back, so you could have a view on the tracks through the windows, it becomes possible to build the C&C RY almost on eye-level. An asset for a N-scale layout.