Tube Puzzle

SAW this serial number on a Northern Line carriage: 51519.

As usual, each number should be used once, and once only, and must be added, subtracted, multiplied or divided to make a balanced equation.
There is a perfect solution, ie one that uses the numbers in the order they appear.
*****
*****
*****
*****
*****
*****
*****
*****
*****
*****
*****
*****
*****
*****
*****
*****
*****
*****

*****
*****
My solution: 5 + (1 x 5) = 1 + 9