This Academy-Award winning western starring and directed by Clint Eastwood featured some filming around Jamestown, CA. 

Sierra RR #3 (along with Coach #6) is prominently displayed along the same stretch of track used in Back to the Future Part III. In fact, it pulls up to the same depot at Red Hills Ranch south of Chinese Camp, CA (which burned in the 1996 fire). Engine #3 is still in use at Railtown 1897 today!