Three Mental Puzzlers: Question #1

This isn't meant to be a trick question. Given the following dilemma, please explain your choice of one of the two possible outcomes.

Scenario :

You are standing on a path near two sets of train tracks. Far to your right, you see one track with 15 people performing maintenance on it. Far to your left, you see another track with 1 person performing maintenance on it. Striaght ahead, you see a train rapidly approaching on the track with the 15 people. Next to you is a track switch lever that would allow you to divert the train onto the other track with the one person. You are too far to visually or audibly notify any of the individuals.

Question:

Knowing that the train will hit and kill all of the individuals on the track that it travels on, do you pull the lever and cause the lone laborer to die, or do you allow the train to continue on its current track and kill all 15 laborers?