You might also take a look at this website I found: https://www.rapidtables.com/web/color/RGB_Color.html

You are more than welcome to pull it off my Google Drive if you want.
https://drive.google.com/drive/folders/ ... drive_link

I finally took the time to update my spreadsheet with updated RGB color codes for Factorio 2.0, so feel free to use them if you wish. Not perfect, but it works when trains need to change colors. Some of the colors are slightly different regarding the blue and grey hues. They are subtle changes ...