John dreamed that he was in a train that entered a tunnel. if a psychologist believed that the dream expressed john's unconscious sexual desires, the psychologist would likely be a

Psychoanalyst

Explanation:

Based on the question it would be safe to say that the psychologist that John went to go see is a Psychoanalyst. These doctors are experts in diagnosing and treating different mental disorders by working with what people go through while conscious and unconscious.

Usually by interpreting dreams and figuring out what may be the cause of them, to then figure out what that person may be repressing and find a solution/treatment.

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