The phrase [終末トレインどこへいく](javascript:void(0)) refers to the title of a Japanese original TV anime called "Shūmatsu Train Doko e Iku?" or "Where Does the End Train Go?" This anime aired from April to June 2024. The story is set in a rural town undergoing mysterious changes, where the protagonist Shizuru Chikura and her friends use an old, stationary train to travel into the outside world in search of a missing friend. The train, known as the "End Train," embarks on a journey into unknown and potentially dangerous territory, with the goal to reconnect with loved ones and face the challenges of an altered world. The destination and ending point of the train journey are a key mystery and thematic focus of the series. The anime combines themes of friendship, survival, and the end times in a unique narrative centered around the train's journey.

Thus, the meaning behind "終末トレインどこへいく" is essentially about a train journey in an apocalyptic or changed world, asking the question, "Where does the end train go?" It metaphorically and literally explores the destination and fate of the characters traveling on this train.