N at W BLUE

[NW Modeling List]

  After veiwing many pictures and models I find myself even more confused about the proper blue to
  use for N at W diesels. From painted brass to various manufactures of plastic models everyone seems
  to have a different color variation. Being from Bellevue,Ohio I know that the color varied from 
  type of engine to the age of the paint and the service area of said engines. What color is color 
  is the most accepted of Polly Scale or Floquil for this application ?