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According to E.F. Carter, the SMJ locomotive colour from 1915 was "crimson-lake" or "lake".[1] I have thus settled on a colour #960018 identified as
Crimson lake.
References
^Carter, Ernest F. (January 1980) [1952]. Britain's Railway Liveries 1825-1948 (3rd ed.). London: Harold Starke. p. 253.
ISBN0 287 66989 0.