Flammable
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Flammable materials are those that can easily catch on fire when leaked, such as fossil fuels or methane. Simple sparks, even ones from minor collisions, can be enough to start a fire when coming in contact with flammable materials. Fire can harm living organisms, spread and do massive damage to the environment and surrounding vehicles.
In case of a suspected flammable gas leak, immediately cut all sources of open flame, such as lighters, lanterns, steam engine fireboxes, sparks from traction loss, etc.