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Are fire extinguishers installed inside the coaches of express trains?
Yes. Federal regulations require at least one fire extinguisher in each car.
If not, why not?
Not applicable (see above).
Will the passengers be unable to use the fire extinguisher in case a fire takes place?
It's possible. The passengers may be incapable of operating a fire extinguisher for some reason, or they may operate it incorrectly, or the fire extinguisher may be faulty.
Or can the fire extinguisher itself trigger a fire in an express train?
Fire extinguishers generally are not capable of causing fires.