Departure! Chuu Chuu! Hello, we are A Train to Autumn! (출발! Chuu Chuu! 안녕하세요, 가을로 가는 기차입니다!)
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—A Train to Autumn
A Train to Autumn (가을로 가는 기차; stylized as A train to autumn) was a four-member ballad group under Cube Entertainment. They officially debuted on November 5, 2018 with the single "That Season You Were In".[1]
They presumably disbanded as their profile was removed from Cube's website.
On July 15, 2018, the group released a single titled "A Watercolor of a Rainy Day" which featured a male-female duet but did not reveal their identities. On November 2, 2018, Cube announced they will officially debut on the 5th with the first single "That Season You Were In", the first of their five-part project series.[1]