Would you kill 9 criminals to save one good person or is that vice versa ?

We all have our own moral system.
According to the human morals, what would be your judgement for this scenario?
If one man stands in an out-of-order railway track and 9 people stand in a completely workable track voluntarily, and if you have the ability to change the track of the high-speed train, to which track would you change the train to? To one man to 9 men's? Would you be willing to kill a man who did nothing wrong or the 9 men who knowingly stood in the way of the train?

Who would you kill?
How would you define morality here?