Final answer:
The question seems to confuse Paul McCartney with Paul Gauguin. McCartney, after The Beatles stopped touring, focused on studio recording and was instrumental in creating the album 'Sgt. Pepper's Lonely Hearts Club Band', not an event involving a train to Paris.
Step-by-step explanation:
The question appears to be based on a misunderstanding. It conflates Paul McCartney of The Beatles with Paul Gauguin, the post-Impressionist artist. The account mentioned refers to Vincent van Gogh and Paul Gauguin, highlighting the night that led Gauguin to leave and subsequently dissolve one of the most famous working relationships in art history. On the other hand, after The Beatles stopped touring in 1966, Paul McCartney didn't have a notable event related to a train to Paris but instead got more actively involved in the recording process, pushing the boundaries of studio work, and was a driving force behind the album 'Sgt. Pepper's Lonely Hearts Club Band'. McCartney used the time after touring to explore innovative songwriting and recording techniques that later defined some of The Beatles' most iconic albums.