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First, you need an excellent lens... such as the Nikon 55mm f/2.8 Micro-Nikkor.
https://petapixel.com/2015/12/24/a-review-of-the-venus-optics-laowa-15mm-f4-and-its-crazy-close-4-7mm-working-distance/Model railroad macro photography is quite different than any other macro photography out there. In most other cases, the goal is to isolate your subject from the background. Obviously, we tend to want to keep everything in focus.The narrower, the angle, the more one is able to reduce depth of field. This actually works in our favor as a 50MM Canon macro lens costs less than one quarter their 180MM lens, while providing us a much better depth of field. That being said, even 50MM stopped down past F16 won't get you more than a few inches.Enter the Laowa 15MM macro.15MM is in ultra-wide territory. When shooting close up, it will give a fisheye appearance. Shoot from a slight distance, however, will provide a really nice ultra wide field of view with a very large depth of field. This may be the first macro lens that would not need focus stacking to get an entire layout section in focus.This is on my list, after I get the Canon 10-18mm wide angle zoom and 40mm prime kit. Both this macro and the 10-18 zoom should provide some interesting options when shooting trains.
I have the Nikkor 55mm f2.8 and don't care for it as nearly as much as my Tamron or Kino Precision made macros.
I have the Nikkor 60mm f2.8, and it is one of the sharpest, most distortion-free macros made....period. I chiefly use mine to digitize my artwork for 100% art prints. Cheerio!Bob Gilmore
Bob, way back in pre-digital days (with my Nikon FG and manual lenses) I used to use extension rings to get extreme close focus capability from any lens. But today, with all the electronic doo-dads in the lens, extension rings are probably not a viable option.