"This Japanese film features a high-speed train rigged with a bomb set to detonate if the train's speed drops below a certain threshold. Screenwriter Graham Yost's father mistakenly believed *Runaway Train* (1985) had a similar plot, which led Yost to conceive the idea for *Speed*. The concept of a vehicle that must maintain a minimum speed to prevent disaster is central to both films."Speed %281994 film%29Wikipedia
