When the Tōkaidō Shinkansen opened in 1964, its top speed was 210 kilometers per hour. In 1992, with the new 300 series trains and the first Nozomi service, the top speed rose from 220 to 270 kilometers per hour. On March 14, 2015, it was raised again, to 285 kilometers per hour. It was the first increase in 23 years.