We must emphasize that psychoanalysis doesn't consider dreams as a product of our mantic aptitude, neither as gods' messenger. The scientific approach, which Freud himself hints at, rejects those "virtues"  of the dream that cannot pass the examination of the scientific investigation.
As far as it concerns him, Freud states that dream is always the hallucinating expression of a repressed wish. He insists on the fact  that the interpretation cannot be deprived of the dreamer's associations, of his recollections and impressions that the elements of the dream, considered separately, evoke to him. In the above quoted dream, Freud would  obtain the following information:

- Travel by train . It suggests to the dreamer a travelling manner, which he doesn't like. Because it's uncomfortable. He (the dreamer) prefers to go by his personal car, especially when he  spends his weekend in a trip to the mountains or at the seaside.

- Forgetting luggage. The dreamer complains of the fact that, from some time, he noticed a suspect change of his character. He  forgets easily, he is absent-minded, confused, inattentive, with his thoughts far away. All these happenings, apparently harmless annoy him. Adding to these, he was never so "scatter-brained" and, of course, he  imitates his wife, who embodies the distraction itself, by this behavior.

Further examining dreamer's impressions, Freud would find out that dreamer's wife behaves like a "little princess" to him, arrogant and all airs and frills, she looks down on her husband, she treats him  with an air of self-satisfied superiority. The conclusion of the dream imposes so without saying: it expresses dreamer's wish to change places with his wife (this is where the idea of imitating her comes from), for him  to be "the prince" and his wife "the servant"(5).

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Freud's statement that dream is the accomplishment of an unconscious desire creates the impression that psychoanalysis brought a revolutionary contribution  in the realm of interpretation. Because it is supposed to posses, in this regard, a vision considered as "scientific", radically opposite to the popular or traditional one.

The facts are not at all like that. Anyone that studies the classification of dreams in the Antiquity period, and I especially refer here to Macrobius' work "Comments upon Scipio's vision", would notice that the tradition also remarked the dreams  with a "scientific" content, the same type as those approached by psychoanalysis.

On short, Macrobius distinguishes four categories of dreams. Three of them are interesting to the interpretation effort, while  the last one remains, so to say, the appanage of common people. The first three categories include: symbolical dream, vision dream and oracular dream (6). The last one refers to the dreams that comes from the nocturnal ebullition of our daytime impressions. We could clearly notice that the last category defines the dreams examined by Freud.

The  conclusion imposing to us as a consequence of the above-mentioned (facts) would be: the ancient mentality also had the knowledge of the dreams of "profane" nature, namely those that aren't worth to interpret them, but  which, later on, represented the subject matter of the psychoanalytical "scientific" research. On the other hand, it's obvious that, being interested in the "profane" dreams, having doubts concerning the traditional  mentality, from a scientific position, Freud ignored the sacred dreams (the first three categories at Macrobius). He gave the sensation that these could be included to the chapter of desire-dreams, familiar to him, when  they are not the result of the poetical creation or of an ideological conjuncture.

Notes:
1. S. Freud, "The Interpretation of Dreams", Science Publishing House, 1993, p. 91.
2. Ibid. p. 92.
3. Ibid.
4. Ibid.
5. It's clearly understood that the dream is not fully interpreted through psychoanalytical method illustrated here. We have restricted to an example of psychoanalysis applied  to dream, simplified at the most.
6. The symbolical dream "covers in metaphors, as in a riddle, a significance that cannot be understood without interpretation". The vision dream, horama, "is a premonitive  development of a future event". The oracular dream, or chrematismos, is recognized when, while sleeping, the parent of the person who dreams or some other respected or impressive person, maybe a priest or a god,  reveals, without any help of the symbols, what will happen, what should or shouldn't be done". (Eric R. Dodds, "Greeks and the Irrational", Meridiane Publishing House, 1983, p. 130).