David Baker ponders whether the eminent locomotive engineer William Stroudley was colour deficient
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Suppose your boss announced to you that black is white. Would you agree if that was the price of keeping your job? Or suppose it was your employee who made this bold statement. Would you humour him if you knew he was vital to the company's success? There is a 150-year-old mysterious case of 'yellow is green' that still divides opinion around the world as to how it came about and how the engineer concerned got away with it.
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