【Bon appétit !】 When the Tohoku Shinkansen was opened in June 1982, the planned section between Ueno in Tokyo and Ōmiya was not complete, with shinkansen services starting and terminating at Ōmiya Station. The Shinkansen Relay was therefore provided to shuttle passengers between Ueno and Ōmiya via the narrow gauge Tohoku Main Line. The Shinkansen Relay service ended on 13 March 1985, the day before the Tohoku Shinkansen opened between Ueno and Ōmiya. The 185-200 series EMUs were reassigned for use on other Limited express services such as the Kusatsu. (https://en.wikipedia.org/wiki/Shinkansen_Relay)