[LMH]

Well it's interesting and a little confusing. Maybe Ned can clarify if I put him on the spot here. (sorry Ned!) The registry shows in the color list, two blues for CSX cars; Princess Blue and Guardsman Blue. No mention of Bright Blue at all and no mention of Viking Blue. I suspect Viking Blue was the color of the early factory team cars only, which were unpainted when sent to the SA and therefore doesn't show as an available color.
However, when you read about how individual standard cars were shipped to the states, there are a number of them painted Bright Blue as Ghiblicup states in his posting. Guardsman Blue is a Ford color I think but was Bright Blue really Guardsman Blue on Cobras once in the US? Not sure ...yet!
Larry