As you said, as of September 2021, most of the JNR-type rolling stock that entered Tokyo Station had disappeared. The Chuo Line Tokyo Station platform was switched to an elevated platform in July 1995. The Yamanote Line 103 series was running until June 1988. Series 205 was running on the Yamanote Line until April 2005. The Japanese National Railways was split and privatized on April 1, 1987.