super express; ultra-express
Refers to a very fast express train or service, often used in historical or brand contexts (e.g., the original 超特急 train in Japan). Also used figuratively for anything extremely fast.
Long ago, a super express ran between Tokyo and Osaka.
彼は超特急で仕事を片付けた。
He finished the work at super express speed.
He finished the job at lightning speed.
I went to Osaka on the super-express train.