The Class E926 (E926形) also known as the East-i, is a high-speed diagnostic train used on JR East's Shinkansen lines.

Entering service in 2001, it is based on the E3 series and carries out line inspections at a maximum speed of 275 km/h (171 mph).

Its loading gauge was also incompatible with the mini-shinkansen, which used narrower trains.

At the time, the mini-shinkansen relied on KuMoYa 743 series inspection railcars.

[3] Since the routes and times of operation of the East i train are not publicly disclosed, it is considered lucky by railway enthusiasts when the viewer sees it.