直ちょく通つう列れっ車しゃ

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Meanings

1

noun

through train; direct train

A train that runs directly between two points without requiring a transfer, often crossing company or line boundaries.

直straightaway, honesty, frankness

通traffic, pass through, avenue

列file, row, rank

直ちょく通つう
直通 is the general concept of direct connection or through service; 直通列車 specifically refers to the train itself.
急きゅう行こう
急行 is an express train that may skip stations, while 直通列車 emphasizes the lack of transfers and may stop at all stations along its route.

Compound of 直通 (direct connection) and 列車 (train).