Just for giggles I decided to break out my Mitutoyo Digital Micrometer (accurate to .0001"). I don't use it much since I stopped designing and prototyping weapons mountable night vision devices and surveillance gear.
Here are the results:
Atlas C55 flex rail is- 0.0268" across the railhead, 0.0558" tall, and 0.0527" across the railfoot
ME C55 weathered flex rail is- 0.0261" across the railhead, 0.0563" tall, and 0.0534" across the railfoot (with none of the "weathering" removed)
Railcraft C55 shiny new rail is- 0.0264" across the railhead, 0.0548" tall, and 0.0540" across the railfoot
I didn't save my Proto87 Stores C55 snippings from my 3-way planed closure points, and I couldn't get my Mitutoyo Micrometer into my built turnouts to get any measurements.
...Just sayin'...
Cheerio!
Bob Gilmore