Thunder
- Blwyddyn: 1929
- Gwlad: United States of America
- Genre: Drama
- Stiwdio: Metro-Goldwyn-Mayer
- Allweddair: train, silent film, flood, lost film, train engineer
- Cyfarwyddwr: William Nigh
- Cast: Lon Chaney, Phyllis Haver, James Murray, Tom Keene, Frances Morris
