The 19 four-car E721-1000 series sets (P4-1 to P4-19) are formed as follows, with two motored ("M") cars and two non-powered trailer ("T") cars.
The KuHa E720 is located at the southern end.

The two motored cars (KuMoHa and MoHa) each have one PS109 single-arm pantograph.
The KuHa cars have a toilet.
The 19 four-car E721-1000 series sets (P4-1 to P4-19) are formed as follows, with two motored ("M") cars and two non-powered trailer ("T") cars. The KuHa E720 is located at the southern end.
The two motored cars (KuMoHa and MoHa) each have one PS109 single-arm pantograph. The KuHa cars have a toilet.
E721 series