The word 列车 is formed by combining two conceptual building blocks: 列, meaning to arrange in a row or a series, and 车, meaning a vehicle or carriage. Together, they create a composite idea of "vehicles arranged in a sequence", which directly and pictorially represents the essential structure of a train, multiple connected cars moving in a line. This formation is a logical semantic compound, where the meaning of the whole is derived from the combined visual and conceptual sum of its parts.