I have several Polly Scale railroad colors just wanted best match

If you're using Pollyscale, D&RGW freight car red is the closest color to RAL 8012 that I have found.
Cheers,

It’s an industrial product. Not a color. It varied from the dull hull red to an almost cherry red hue.

To look for the “correct “ color is impossible.

Guess I'm too old! Fnrom the early to mid 1950's and earlier, the standard primer for most metals was known as " red lead".
You can still buy it if you know where and how.
Why red lead? Because it stuck like glue, and mo I'mst paints of that era bonded to it. Didn't seem to chip, and actually went on kinda thick. Color wise, it's a darkish red/brown. Very similar to the AK logo on this page. The one serious advantage red lead has over regular primers is that it's not porus. Water won't get under it. It was the standard for priming steel for a long time world wide. Red oxide is slightly redder in color, and much thinner viscosity.
Gary