Drawing on the style of the first "Amenity Vehicles," the body structure is made as broad as possible for rolling stock and provides spaciousness hitherto unknown in train passenger cabins. Both the internal and external design reflect the logo colors of the Boso expresses, namely blue (the deep blue of the Pacific), yellow (the brilliant sunshine and rape blossom of the Boso region) and white (summer beaches). All these factors combine to provide a comfortable journey.

Type Capacity (Seating)
Electric System	DC 1500V, Overhead
Body Length	20500mm(Driving car) 20000mm(Middle car)
Body Width	2946mm
Body Height	3760mm(Driving car)　3550mm(Middle car)