181 series
The (and the earlier 151 and 161 series variants) was a Japanese limited express electric multiple unit (EMU) type operated by Japanese National Railways (JNR). Variants. The 151 series trains were introduced in 1958 on "Kodama" limited services on the Tokaido Main Line. 161 series trains were introduced in 1959 on "Toki" limited services on the Joetsu Line. Some 151 and 161 series cars were subsequently modified to become 181 series alongside newly built 181 series cars.