sentences:  Its maximum operation was 14 services (7 round-trips) a day in the mid-1970s, and all of them were connected with the Tōkaidō Shinkansen.At the end of the 1970s, the number of "Akatsuki" services was reduced due to decreasing ridership.From November 1986, "Akatsuki" remains as only two services (one round-trips) a day.