East Japan Railway Company (JR East) has disclosed details about a train malfunction of a non-passenger train that occurred on the Tohoku Shinkansen at around 11:24 AM on June 17.
A train malfunction occurred on a non-passenger E8 series train consisting of 7 cars running between Utsunomiya and Nasushiobara stations, causing it to stop between stations. Since the train could not move on its own power, passengers from a following train that stopped between stations were guided safely, and services throughout the line resumed at 5 PM after the vehicle was moved.
The malfunctioning train was en route from Ueno Station to Morioka Station and was undergoing verification runs before being used as an operational vehicle following its completion on June 10. The presumed cause is a failure of the auxiliary power unit, which caused power not to be supplied to the main conversion equipment, rendering the cooling device within it non-functional. This triggered the circuit protection function, preventing the motor that drives the train from operating.
Additionally, train malfunctions occurred with “Tsubasa 139” halted at Oyama Station, a non-passenger train halted at Koriyama Station, and “Tsubasa 139” running between Fukushima and Sasakino stations on the Yamagata Shinkansen. Investigations on any connection between these incidents, which also involved E8 series trains, are ongoing.
Until the cause is identified, all solo operations of the E8 series will be suspended.
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