| E721 / SAT721 / AB900 series | |
| Manufacturer: | Kawasaki Heavy Industries, Tokyu Car Corporation, J-TREC (Niitsu and Yokohama) |
| Replaced: | 455 series, 417 series, 717 series, 719 series |
| Yearconstruction: | 2006– |
| Yearservice: | February 2007 |
| Numberconstruction: | 36 vehicles (9 sets) |
| Numberbuilt: | 146 vehicles (63 sets) |
| Numberservice: | 142 vehicles (61 sets) |
| Numberscrapped: | 4 vehicles (2 sets, tsunami damage) |
| Formation: | 2/4 cars per set |
| Fleetnumbers: | P1–P44, P501–P504, P4-1–P4-19, SA101–SA103 |
| Operator: | JR East Sendai Airport Transit (SAT721) Abukuma Express (AB900) |
| Depots: | Sendai |
| Carbody: | Stainless steel |
| Carlength: | 20000mm |
| Width: | 2950mm |
| Floorheight: | 950mm |
| Doors: | 3 pairs per side |
| Maxspeed: | 120abbr=onNaNabbr=on |
| Poweroutput: | 500 kW per motor |
| Electricsystem: | 20 kV AC (50 Hz) overhead catenary |
| Collectionmethod: | Pantograph |
| Bogies: | DT72 (motored), TR256 (trailer) |
| Safety: | ATS-Ps |
| Multipleworking: | 701 series |
The is an AC electric multiple unit (EMU) train type operated by East Japan Railway Company (JR East) on services in the Sendai area of Japan since February 2007.
, the fleet consists of 42 two-car E721-0 series sets (P-2 to P-44), four E721-500 series two-car sets (P-501 to P-504), and three SAT721 series two-car sets (SA101 to SA103), formed as follows with one motored (Mc) and one trailer (Tc') car.[1]
| Designation | Mc | Tc' | |
|---|---|---|---|
| Numbering | KuMoHa E721-xx | KuHa E720-xx |
The KuMoHa cars have one PS109 single-arm pantograph. The KuHa cars have a toilet.[1]
| Designation | Mc | Tc' | |
|---|---|---|---|
| Numbering | KuMoHa E721-50x | KuHa E720-50x |
The KuMoHa cars have one PS109 single-arm pantograph. The KuHa cars have a toilet.[1]
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.[2] The KuHa E720 is located at the southern end.[2]
| Designation | Tc' | M | T | Mc | |
|---|---|---|---|---|---|
| Numbering | KuHa E720-10xx | MoHa E721-10xx | SaHa E721-10xx | KuMoHa E7210-10xx | |
| Weight (t) | 34.3 | 32.0 | 37.2 | 39.1 | |
| Capacity (seated/total) | 50/132 | 62/152 | 56/138 | ||
The two motored cars (KuMoHa and MoHa) each have one PS109 single-arm pantograph.[2] The KuHa cars have a toilet.[2]
The two-car SAT721 series sets are formed as follows.
| Designation | Mc | Tc' | |
|---|---|---|---|
| Numbering | SAT721-10x | SAT720-10x |
The KuMoHa cars have one PS109 single-arm pantograph. The KuHa cars have a toilet.[1]
The Abukuma Express AB900 series are derived from the E721-500 and SAT721 series used for JR East.
Sets are formed as follows.
| Set | Numbering | ||
|---|---|---|---|
| AB-1 | AB901-1 | AB900-1 | |
| AB-2 | AB901-2 | AB900-2 | |
| AB-3[3] | AB901-3 | AB900-3 | |
| AB-4[4] | AB901-4 | AB900-4 | |
| AB-5 | AB901-5 | AB900-5 | |
The first E721-0 series sets were delivered from December 2006, and entered service on 1 February 2007 on Tohoku Main Line services.[1] The first E721-500 and SAT721 series sets were delivered from February 2006 and entered service on Sendai Airport services on 18 March 2007.[1]
Two sets, P-1 and P-19, were derailed and badly damaged by the 2011 Tōhoku earthquake and tsunami on 11 March 2011 while at Shinchi Station. Both sets were written off and scrapped.[1]
The first of a fleet of 19 new four-car E721-1000 sets (76 vehicles in total) was introduced on 30 November 2016[5] on Tohoku Main Line, Joban Line, and Senzan Line services, replacing older 719 series units.[6] The new trains are built by J-TREC, with construction shared between the company's Yokohama and Niitsu factories.[6] These trains feature LED interior lighting.[6]
The first four E721-1000 series intermediate cars were delivered from J-TREC's Niitsu factory to its Yokohama factory in September 2016 to be combined with driving cars built there.[7]
In order to replace their 8100 series trains, Abukuma Express announced the order of new AB900 series trains in summer 2018. They are based on the E721 series,[8] and are the first new trains for Abukuma Express since 1988.[9] The first AB900 series set was delivered in February 2019. It entered service on 1 July 2019.[9]
The manufacturers and delivery dates for the fleet are as shown below.[1]
| Set No. | Manufacturer | Date delivered | Date withdrawn |
|---|---|---|---|
| P-1 | Kawasaki Heavy Industries | 28 November 2006[10] | 12 March 2011[11] |
| P-2 | 17 January 2007 | ||
| P-3 | |||
| P-4 | |||
| P-5 | Tokyu Car | 18 December 2006 | |
| P-6 | |||
| P-7 | Kawasaki Heavy Industries | 15 January 2007 | |
| P-8 | 6 February 2007 | ||
| P-9 | |||
| P-10 | 23 February 2007 | ||
| P-11 | |||
| P-12 | Tokyu Car | 15 January 2007 | |
| P-13 | |||
| P-14 | Kawasaki Heavy Industries | 28 February 2007 | |
| P-15 | |||
| P-16 | 8 March 2007 | ||
| P-17 | |||
| P-18 | 23 March 2007 | ||
| P-19 | 23 March 2007 | 12 March 2011 | |
| P-20 | 23 March 2007 | ||
| P-21 | |||
| P-22 | 17 April 2007 | ||
| P-23 | |||
| P-24 | 27 April 2007 | ||
| P-25 | |||
| P-26 | |||
| P-27 | |||
| P-28 | 31 May 2007 | ||
| P-29 | |||
| P-30 | |||
| P-31 | |||
| P-32 | 6 July 2007 | ||
| P-33 | |||
| P-34 | Tokyu Car | 30 August 2007 | |
| P-35 | |||
| P-36 | 26 September 2007 | ||
| P-37 | |||
| P-38 | Kawasaki Heavy Industries | 2 November 2007 | |
| P-39 | |||
| P-40 | 13 September 2010 | ||
| P-41 | |||
| P-42 | |||
| P-43 | |||
| P-44 |
The delivery of E721-500 series cars are as follows:
| Set No. | Manufacturer | Date delivered | |
|---|---|---|---|
| P-501 | Kawasaki Heavy Industries | 17 February 2006 | |
| P-502 | 30 September 2006 | ||
| P-503 | |||
| P-504 | Tokyu Car | 25 October 2006 |
All manufactured by J-TREC.
| Set No. | Date delivered | |
|---|---|---|
| P4-1 | 21 October 2016[12] | |
| P4-2 | 26 October 2016 | |
| P4-3 | 11 November 2016 | |
| P4-4 | 16 November 2016 | |
| P4-5 | 28 November 2016 | |
| P4-6 | 1 December 2016 | |
| P4-7 | 6 December 2016 | |
| P4-8 | 14 December 2016 | |
| P4-9 | 27 December 2016 | |
| P4-10 | 26 December 2016 | |
| P4-11 | ||
| P4-12 | ||
| P4-13 | ||
| P4-14 | ||
| P4-15 | ||
| P4-16 | ||
| P4-17 | ||
| P4-18 | ||
| P4-19 |
All sets are manufactured by Kawasaki and delivered as of 20 November 2006.
| Set No. | |
|---|---|
| SA101 | |
| SA102 | |
| SA103 |
All sets are manufactured by J-TREC.
| Set No. | Date delivered | |
|---|---|---|
| AB-1 | 21 February 2019[13] | |
| AB-2 | February 2020[14] | |
| AB-3 | 25 January 2022[15] | |
| AB-4 | ||
| AB-5 |