"The First Train Headin' South" by Johnny Horton is a country song that tells the story of someone who receives a letter from their loved one, revealing their love and prompting them to immediately leave and catch the first train heading south. The lyrics emphasize the surprise and joy the narrator feels upon learning how much their baby (term of endearment for their loved one) loves them. They express the eagerness to pack their bags and depart, symbolizing the narrator's desire to be reunited with their beloved. The song's narrative imagines receiving this letter in different locations, such as Idaho, Iowa, and Ohio, each suggesting a varying level of commitment to the relationship and the willingness to overcome any obstacles to reach the southern destination. However, when the narrator mentions receiving the letter in Maine, it is evident that they feel the same strong emotions regardless of their physical location. The repetitive chorus emphasizes their realization of their partner's love and their determination to catch the first available train heading south, regardless of any hurdles. Overall, "The First Train Headin' South" portrays a story of love and longing, highlighting the protagonist's understanding of their loved one's feelings and their willingness to make any necessary journey to be reunited.