irrational conclusion

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WT: Well, the first poem starts in Saint Charles train station in Marseilles, and the traveler hears the train shrieking and thinks there are elephants trumpeting at the station, which is not a completely irrational conclusion if one is really "traveling light" of preconceptions.
I could go on but my description surely makes that of a information, go to human being or would that be an irrational conclusion? I also have a brain, would you believe?
In a joint attack on Mr Milburn, the QCs accused him of reaching an irrational conclusion that the evidence to the inquiry should be heard in private.