The car - which Sir Jimmy called "The Beast" and still has his personalised JS 247 plate - is expected to be the highest priced single item at the sale in Leeds.
It was bought by an internet buyer as hundreds of people packed Savile Hall in the Royal Armouries complex.
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Most escaping a frost overnight with cloudier skies and patchy rain. Turning colder on Monday stronger northerly winds, rain and hill snow.
By the end of Monday a cold northerly wind, widespread frost and risk of wintry showers
Flying Scotsman travelled alongside three modern trains to celebrate the "past, present and future" of Britain's railway this morning.