June 5, 1925: Miyagi Electric Railway (later Senseki Line): Sendai – Nishi-Shiogama.

January 1, 1926: Miyaginohara Station opens.

April 14, 1926: Nishi-Shiogama – Hon-Shiogama section opens.

April 18, 1927: Hon-Shiogama – Matsushima-Kōen (later Matsushima-Kaigan Station) section opens.

April 10, 1928: Matsushima-Kōen – Rikuzen-Ono section opens.

May 15, 1928: Nigatake Station opens.

November 22, 1928: Rikuzen-Ono – Ishinomaki section opens, connecting Sendai to Ishinomaki.

June 1, 1929: Kazuma Station opens.

October 23, 1931: Nobiru Station becomes Tōhoku-Suma Station.

December 1, 1931: Tōna Station opens.

January 8, 1932: Ishinomaki station becomes Miyaden-Ishinomaki Station.

August 1, 1932: Geba Station opens.

February 1, 1939: Miyaden-Yamashita Station (later Rikuzen-Yamashita Station) opens.

November 7, 1939: Miyaden-Yamashita – Kama (later Ishinomaki Port Station) freight connection opens.

May 1, 1944: Miyagi Electric Railway is nationalized, becomes the Senseki Line; Higashi-Nanabanchō Station becomes Sendai Higashi-Guchi Station, Hamada Station becomes Rikuzen-Hamada Station, Matsushima-Kōen becomes Matsushima-Kaigan Station, Tomiyama becomes Rikuzen-Tomiyama Station, Ōtsuka becomes Rikuzen-Ōtsuka Station, Tōhoku-Suma becomes Nobiru Station, and Miyaden-Ishinomaki becomes Ishinomaki Station.

June 1, 1952: Sendai – Sendai Higashi-Guchi section stops operation.

September 26, 1952: Sendai – Sendai Higashi-Gushi section abolished.

1957: Rapid trains begin operation.

February 23, 1968: Track doubled on Fukudamachi – Tagajō section.

March 19, 1968: Track doubled on Rikuzen-Haranomachi – Fukudamachi section.

October 11, 1968: Kama – Ishinomaki-Futō freight connection opens
September 26, 1969: Track doubled on Tagajō to Nishi-Shiogama section.

April 1, 1971: Kama – Ishinomaki-Minato freight connection abolished.

March 15, 1972: Kama Station becomes Ishinomaki-Minato Station.

1974: 72 series and 79 series trains begin operation.

October 1, 1979: 103 series trains begin operation.

April 1, 1981: Nakanosakae Station opens.

November 1, 1981:  Nishi-Shiogama – Higashi-Shiogama section elevated, double-tracked; Hon-Shiogama Station and Higashi-Shiogama Station moved.

October 2, 1983: New weekend schedule introduced.

March 31, 1987: Higashi-Yamoto Station opens.

April 1, 1987: Senseki Line becomes part of the East Japan Railway Company (JR East).

March 13, 1988: Rapid trains renamed Umikaze; scheduling changes.

July 21, 1990: Ishinomaki and Senseki Lines' Ishinomaki stations are merged.

November 1, 1999: Ishinomaki-Minato – Ishinomaki-Futō; freight connection abolished.

March 11, 2000: Sendai – Rikuzen-Haranomachi section moved underground; Aoba-dōri – Sendai section added.

November 5, 2002: 205-3100 series trains begin operation.

July 2004: Last remaining 103 series trains withdrawn.

March 13, 2004: Kozurushinden Station opens.

October 16, 2004: "Umikaze" name is discontinued; weekday and Saturday schedules are merged.

March 16, 2005: Nishi-Shiogama Station becomes unmanned.

November 2006: One 4-car 103 series train is brought out of storage and reinstated into service.

October 21, 2009: JR East's last remaining 103 series train is withdrawn from service.

March 11, 2011: Two Senseki Line trains were derailed and badly damaged by the 2011 Tōhoku earthquake and tsunami.

2015: Services are restored over the entire length of the line.

26 March 2016: Ishinomakiayumino Station opens.
June 5, 1925: Miyagi Electric Railway (later Senseki Line): Sendai – Nishi-Shiogama.
January 1, 1926: Miyaginohara Station opens.
April 14, 1926: Nishi-Shiogama – Hon-Shiogama section opens.
April 18, 1927: Hon-Shiogama – Matsushima-Kōen (later Matsushima-Kaigan Station) section opens.
April 10, 1928: Matsushima-Kōen – Rikuzen-Ono section opens.
May 15, 1928: Nigatake Station opens.
November 22, 1928: Rikuzen-Ono – Ishinomaki section opens, connecting Sendai to Ishinomaki.
June 1, 1929: Kazuma Station opens.
October 23, 1931: Nobiru Station becomes Tōhoku-Suma Station.
December 1, 1931: Tōna Station opens.
January 8, 1932: Ishinomaki station becomes Miyaden-Ishinomaki Station.
August 1, 1932: Geba Station opens.
February 1, 1939: Miyaden-Yamashita Station (later Rikuzen-Yamashita Station) opens.
November 7, 1939: Miyaden-Yamashita – Kama (later Ishinomaki Port Station) freight connection opens.
May 1, 1944: Miyagi Electric Railway is nationalized, becomes the Senseki Line; Higashi-Nanabanchō Station becomes Sendai Higashi-Guchi Station, Hamada Station becomes Rikuzen-Hamada Station, Matsushima-Kōen becomes Matsushima-Kaigan Station, Tomiyama becomes Rikuzen-Tomiyama Station, Ōtsuka becomes Rikuzen-Ōtsuka Station, Tōhoku-Suma becomes Nobiru Station, and Miyaden-Ishinomaki becomes Ishinomaki Station.
June 1, 1952: Sendai – Sendai Higashi-Guchi section stops operation.
September 26, 1952: Sendai – Sendai Higashi-Gushi section abolished.
1957: Rapid trains begin operation.
February 23, 1968: Track doubled on Fukudamachi – Tagajō section.
March 19, 1968: Track doubled on Rikuzen-Haranomachi – Fukudamachi section.
October 11, 1968: Kama – Ishinomaki-Futō freight connection opens
September 26, 1969: Track doubled on Tagajō to Nishi-Shiogama section.
April 1, 1971: Kama – Ishinomaki-Minato freight connection abolished.
March 15, 1972: Kama Station becomes Ishinomaki-Minato Station.
1974: 72 series and 79 series trains begin operation.
October 1, 1979: 103 series trains begin operation.
April 1, 1981: Nakanosakae Station opens.
November 1, 1981:  Nishi-Shiogama – Higashi-Shiogama section elevated, double-tracked; Hon-Shiogama Station and Higashi-Shiogama Station moved.
October 2, 1983: New weekend schedule introduced.
March 31, 1987: Higashi-Yamoto Station opens.
April 1, 1987: Senseki Line becomes part of the East Japan Railway Company (JR East).
March 13, 1988: Rapid trains renamed Umikaze; scheduling changes.
July 21, 1990: Ishinomaki and Senseki Lines' Ishinomaki stations are merged.
November 1, 1999: Ishinomaki-Minato – Ishinomaki-Futō; freight connection abolished.
March 11, 2000: Sendai – Rikuzen-Haranomachi section moved underground; Aoba-dōri – Sendai section added.
November 5, 2002: 205-3100 series trains begin operation.
July 2004: Last remaining 103 series trains withdrawn.
March 13, 2004: Kozurushinden Station opens.
October 16, 2004: "Umikaze" name is discontinued; weekday and Saturday schedules are merged.
March 16, 2005: Nishi-Shiogama Station becomes unmanned.
November 2006: One 4-car 103 series train is brought out of storage and reinstated into service.
October 21, 2009: JR East's last remaining 103 series train is withdrawn from service.
March 11, 2011: Two Senseki Line trains were derailed and badly damaged by the 2011 Tōhoku earthquake and tsunami.
2015: Services are restored over the entire length of the line.
26 March 2016: Ishinomakiayumino Station opens.
Senseki Line