Train?

Brody and I went on a bike ride together. We were having a great time going on the back trails together. 

I decided to get on the rail road track and ride under the bridge. Brody followed me for awhile until he saw a train light which turned from red to yellow. 

He said, "Dad, we need to get off this track because the light changed." He threw his bike in the ditch and jumped for his life. 

With all the energy I was expecting some big; however, I looked both ways and couldn't see a train in sight.