The trains also feature a pendular[1] tilting system which will be an improvement over the current 381 series trainsets.

The tilting system is jointly developed by JR West, the Railway Technical Research Institute, and Kawasaki.

[3] In addition to the regular seating arrangement, there is a section reserved for tables.

[9] Details of the new trains, revealed to be classified as 273 series, were announced by JR West on 16 February 2022.

[10] Kinki Sharyo announced it would be responsible for manufacturing the trainsets on 7 March 2022.