India, Sept. 20 -- 'Unstoppable', 'Bullet Train Explosion', 'Runaway Train', 'Last Passenger', and the home-grown wonder 'The Burning Train'-all of these are movies centred around trains spiralling out of control. With a brake failure, a malfunctioning system, or a sudden rule about maintaining a minimum speed,chaos unfolds. Add in fire, a suicidal driver, a bomb, and an angry lover, and it makes for a quintessential train thriller.

What stands out in these films is the eventual solution-someone manages to decouple something. By that, we mean something heavy: a compartment, a machinery module, a cargo coach, or even a section of track. That is the cinematic breakthrough-the idea that even a fast-moving, complex, engineering-heavy system ...