If you want to send it forward, you put it over here.

If you want to cut off the power, you keep it in the middle." Hurstwood smiled at the simple information.
"Now, this handle here regulates your speed.

To here," he said, pointing with his finger, "gives you about four miles an hour.

This is eight.
When it's full on, you make about fourteen miles an hour." Hurstwood watched him calmly.

He had seen motormen work before.