Synopsis by Hal Erickson
While visiting a train station with their families, Ingalls sisters Mary (Melissa Sue Anderson) and Laura (Melissa Gilbert) and the Edwards' adopted son, Carl (Brian Part), sneak into an empty caboose. Carl accidentally discouples the car from the rest of the train, thereby propelling himself and the girls on a treacherous, 30-mile downhill ride. As the caboose races toward certain destruction, Charles (Michael Landon) desperately tries to rescue the kids. This episode was filmed in the Gold Rush Country of California.