Near Donner lake, there are some old train tunnels that have been abandoned. The old wood and iron of the torn out rails is scattered all down the side of the mountain. We climbed up to the tunnels and walked through them. It was so much fun. Sometimes maintenance cars drive through them and we were lucky enough to be in the middle of a tunnel when one came by. John and I heard a deep rumble and crunching. A booming echo. Not knowing it was a car at first we looked at each other freaked out. I was terrified that every movie I've seen about ghost trains was about to come true. We ran for the walls and realized it was a car coming and we all relaxed.