If/when a track diagram is received from the author, it almost always is published with the article OR as an extra (if available) in the Digital Edition of that respective issue. There are exceptions to this, such as (1) no track plan available because the author/layout builder never used one in developing the layout, or (2) the layout is so large and/or complex that excessive editorial space would need to be devoted to displaying it.
When we do receive a track diagram, the graphics person I work with remotely (he is in Easton, PA) in designing each issue generally creates a simplified version for publication. It provides the layout dimensions, the track configuration, and perhaps some of the main features.
Keep in mind that ALL of our layout features are solely the creation of the author, with perhaps the help of a family member or friend. The Author Guidelines I provide to prospective authors asks for about 1,500 words of text; a large number of hi-resolution images for the editor (that would be me) to choose from; a brief author bio and author photo; and a track diagram, if available. After photos are selected, the author is also asked to assist with captions. And if one of the author's images is selected as a possible cover image, I generally work with the individual, via multiple emails, to have him or her "fine tune" the image to fit our cover requirements. This, in itself, sometimes requires the author to devote a whole lot of additional time and effort to the project.
If you have ever had your layout published in OGR or any other magazine, you already know that getting published involves a a good bit of work. The vast majority of our authors are not professional writers or photographers, but I am always happy to work with each and every one of them, if and when necessary, to give their creativity a proper presentation.
And if you have never had your layout published in OGR, please consider giving it a shot! Send me an email and I will send you our Author Guidelines and Photo Tips sheet to get you started. You'll make a few bucks if your layout is published, but the real reward is the satisfaction received from sharing your handiwork--in a tangible and permanent way--with your fellow hobbyists and others who may be inspired by what you have created.