A waste disposal company has a Russian nuclear bomb to transport, and an employee decides to save money by concealing it on a freight train. The train, also loaded with hazardous and flammable chemicals, suffers a brake failure and becomes a runaway heading for Denver. A wreck would be bad enough, but much, much worse if the bomb goes off. A heroic NTSB investigator boards the train; he and the railwaymen try various ways to stop the train, but nothing works. Meanwhile Denver residents are struggling to collect their families and then leave town, despite rioters and gridlock. Will the train have to be derailed to stop it? If it does derail, will the bomb explode, and if it does, what then?
Written by Anonymous
Pre-release publicity and commercials referred to atomic waste, not an atomic bomb, being carried on the train.
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Goofs
Incorrectly regarded as goofs:
Although many people think that a nearby explosion or fire cannot cause an atomic device to detonate, this isn't necessarily so. While an atomic explosion is a very difficult thing to cause, it is not unknown for accidental detonations of the high explosives in atomic weapons to take place when they are exposed to fire, extreme impacts or nearby explosions. Although modern devices are designed to be very safe and almost immune to such a high explosive detonation leading to a nuclear explosion, older devices from the 1940s and 1950s weren't as safe, and it was known that any high explosive detonation could lead to at least a partial nuclear detonation. This was why most weapons of that era had removable nuclear cores that were only inserted into the weapon after take-off and after orders for attack had been received - With the core removed, there was no chance of a crash or fire leading to a nuclear explosion. After the 1950s, design improvements made many nuclear weapons "one-point safe", meaning that the accidental firing of one of the detonators in the device had a one-in-a-million chance of causing a measurable nuclear yield. However, some device designs still in use today cannot be made completely "one-point safe", and so remain at risk of accidental detonation. Most at risk are so-called "gun-type" devices similar to the Little Boy bomb dropped on Hiroshima, which have only a single detonator, and any accidental firing of this detonator will always cause a nuclear explosion. Although little-used today, this design was used for the four bombs built in the 1980s by South Africa. As the internal design of most Russian devices is unknown, it is not impossible that a Russian device could use this design and so be very prone to an accidental detonation.
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