On 25th, I found a guide board above the stairway at a entrance of Ueno-okachimachi Station on Toei Oedo Line, with which the one about Naka-okachimachi Station on Tokyo Metro Hibiya Line was put down, but on which the letter of the train toward Kikuna on Tokyu Toyoko Line still remains.
Over a year has passed since the end of the operation of Hibiya Line trains for Kikuna. Though the letter on the boards in Tokyo Metro stations may be erased, this one wasn't because of under the jurisdiction of Bureau of Tokyo Metropolitan Transportation and no change on Toei Oedo Line. Is it a bad effect of the separation of two underground railway companies in Tokyo?