The 157 series sets were subsequently fitted with air-conditioning and transferred to Tokaido Main Line duties.

[4] From 1 April 1961, the seasonal Ideyu semi express services that operated between Tokyo and Itō were extended to form new seasonal Shōnan Nikkō services operating between Itō and Nikkō.

[5] From 25 March 1963, the service was upgraded to "Express" status with the introduction of new 165 series EMUs, running as 7-car formations with the inclusion of a "SaRo" Green (first class) car.

[7] The name was subsequently revived from 18 March 2006 as a limited express service operated jointly by JR East and Tobu between Shinjuku and Tōbu Nikkō, utilizing a newly constructed link between the two railways' tracks at Kurihashi Station, where trains stop briefly for a crew change.

[1] From the start of the revised timetable on 16 March 2013, Nikkō services also stop at Urawa Station.