快かい速そく特とっ急きゅう

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Meanings

1

noun

rapid limited express; rapid express

A train service category faster than a regular limited express, often with fewer stops. Used primarily in railway contexts.

cheerful, pleasant, agreeable

速quick, fast

特special

急hurry, emergency, sudden

特とっ急きゅう
特急 is a standard limited express, while 快速特急 is an even faster variant with fewer stops.
快かい速そく
快速 is a rapid service, generally slower than 特急 and 快速特急, with more stops.

Compound of 快速 (rapid) and 特急 (limited express), reflecting a train service that combines speed with limited stops.