The Bullet Train

(also known as Super Express 109) is a 1975 Japanese action thriller film directed by Junya Satō and starring Ken Takakura, Sonny Chiba, and Ken Utsui. When a Shinkansen ("bullet train") is threatened with a bomb that will explode automatically if it slows below 80 km/h unless a ransom is paid, police race to find the bombers and to learn how to defuse the bomb. Plot Tetsuo Okita is a former businessman who lost his manufacturing company to bankruptcy and separated from his wife and son a year earlier. Desperate to make ends meet and start over, he collaborates with activist Masaru Koga and his former employee Hiroshi Ōshiro in an elaborate plot to extort money from the government. Hikari 109 is a high-speed 0 series bullet train carrying 1,500 passengers from Tokyo to Hakata. Shortly after the train's departure, railway security head Miyashita is notified by Okita that a bomb has been planted aboard and will explode if the train slows down below 80 km/h. As proof of the bomb's efficiency, Okita tells Miyashita that a similar bomb has been placed on freight train 5790 bound from Yūbari to Oiwake. When freight train 5790 indeed explodes, Hikari 109s conductor Aoki is informed by Shinkansen director Kuramochi not to slow down the train below 120 km/h while the security personnel aboard the train search for the bomb - thus delaying the trip to Hakata by three hours. Police officials back in Tokyo are tasked to either find the bomber or the bomb first. Back aboard Hikari 109, passengers start becoming weary and demand for the train to stop when security does a second search. For the duration of the journey, Kuramochi must coordinate with Aoki on timing the train's speed and position to avoid incoming traffic while keeping it safe from the speed-sensitive detonator. Okita calls the National Railway authorities again; this time, he demands US$5 million in an aluminum suitcase in exchange for the safety of Hikari 109s passengers. As the Prime Minister prepares the ransom, police find their first lead when a cigarette pack containing fingerprints of Koga are found at Yūbari station prior to freight train 5790's departure.