The phrase refers to a children’s picture book, often a sing-along, that typically depicts various vehicles arriving at a train station. The illustrations commonly feature anthropomorphic characters, and the narrative follows the sequence of these vehicles and their drivers arriving at the location. An example includes a bus driver and a fire engine arriving in turn.
Such a book provides several benefits to young children. It aids in developing vocabulary related to transportation and occupations. The repetitive nature of the song structure encourages memory skills and participation. Historically, these kinds of books have been a staple in early childhood education, contributing to literacy and auditory processing.