What is the Trolley Problem

You are the driver of a train that is hurtling down a railway line. It's out of control and the brakes have failed. Ahead, five workers are working on the track and apparently face certain death. You try to stop by you can’t. Then, you notice a side track on the right, where there is one worker on the track. Do you turn the train down the side track, killing one person, or continue straight ahead and kill the five workers. What should you do? Should you steer the train down the side track?