ICBMs are large, and not easily mobile. For this reason, they are traditionally launched from fixed
missile silos. However, keeping missiles in fixed positions leaves them vulnerable to a
pre-emptive nuclear strike. For
strategic deterrence, nuclear-armed nations seek to ensure
mutually assured destruction, meaning that if one nation launches a nuclear first strike, the target nation would still be able to launch a retaliatory nuclear strike.
Advantages Rail-mobile ICBM systems are harder to destroy than fixed positions, as they can travel anywhere along a nation's rail network, and hide from satellite surveillance in tunnels. During times of heightened international tensions, railroad based ICBMs can be rapidly mobilized and spread out across a country's railroad network as an insurance policy.
Disadvantages Railroad-based ICBMs also have several drawbacks. While basing them on railroad tracks makes them flexible, they are still limited to where railroad tracks exist. Railroad tracks are also vulnerable to
sabotage, which would be a major concern during times of war. It is also difficult to maintain security along vast railroad networks, even during peacetime. == Examples ==