A brand new Sotetsu 20000 Series train set undergoing trial runs at Shinagawa Station in late 2019.
This is the 10-car variant that was first introduced in 2018, so this would be one of the later sets built. The distinctive paint color is called "Yokohama Navy Blue", which is featured on other Sotetsu trains.
Rear of train:
Platform signboard during the train's layover:
