Regarding safety improvements, dampers will be installed to prevent the train from swaying during earthquakes, helping prevent derailments. The braking distance will be 15% shorter than the E5 series, allowing the train to stop quickly in an emergency. The train's exterior combines two shades of green, representing the mountains of the Tohoku region, and features curves reminiscent of cherry blossom petals, the company said. East Japan Railway, known as JR East, is preparing for an extension of the Hokkaido Shinkansen, which connects the Tohoku line to Sapporo. Further improvements to the trains and track facilities, such as increasing speeds in preparation for the extension, will be considered in the future.