Two More Tube Puzzles

TRAVELLING on the Northern Line to Colliers Wood to meet a chess friend recently on his 83rd birthday, I was greeted by two more-interesting-than-usual serial numbers on the carriages I rode in.
Heading south, the serial number was 52594. As usual, each number should be used once, and once only, and must be added, subtracted, multiplied or divided to make a balanced equation.
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My solution: 9 = (4 x 2) + (5 ÷  5)
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Returning north, the serial number was 51649. As usual, each number should be used once, and once only, and must be added, subtracted, multiplied or divided to make a balanced equation.
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My solution: 9 + 1 = 5 x (6 - 4)