Editing Line 1 (Beijing Subway) (section)

==History==
[[File:YUQUANLU Station 20181117.jpg|thumb|right|[[Yuquan Lu station]], Opened on August 5, 1971. The first phase of the Beijing subway project groundbreaking ceremony was held west of Yuquanlu Road.]]
The first section of subway in Beijing officially started trial operation on January 15, 1971. It was {{convert|10.7|km|abbr=on}} long and ran between [[Beijing railway station]] to {{stl|BJS|Gongzhufen}},{{efn|name=Lixin|In 1970s, Gongzhufen was called Lixin (立新)}} which today is a section of Line 1 and 2.<ref name="地铁大事记2">{{cite web |url=http://www.bjsubway.com/node/1842 |script-title=zh:地铁公司大事记1971--1980年 |publisher=Beijing Subway}}</ref> A few months later, on August 15, 1971, the line was extended 3 stations west, to {{stl|BJS|Yuquanlu}}. The line was extended again to {{stl|BJS|Gucheng}} in November. On April 23, 1973, the line was extended {{stl|BJS|Pingguoyuan}}, at this point the line is {{convert|23.6|km|abbr=on}} long with 17 stations.<ref name="地铁大事记2" /> On September 15, 1981, the line was again extended westward to {{stl|BJS|Fushouling}} creating a {{convert|27.6|km|abbr=on}} long line with 19 stations. The line was transferred to the newly created Beijing Mass Transit Operation Corporation and was officially opened to the public, ending the decade long trial operation period. By 1981, the annual passenger volume of Beijing Subway was 64.66 million passengers, with a daily average of 177,000 passenger trips.<ref>{{cite web|url=http://www.bjsubway.com/node/1840|script-title=zh:地铁公司1981--1990年地铁大事记|access-date=2011-02-03|archive-date=2011-01-01|archive-url=https://web.archive.org/web/20110101042234/http://www.bjsubway.com/node/1840|url-status=dead}}</ref>

On August 15, 1986, the second phase of subway construction started and a feasibility study on the construction of the new line between of Fuxingmen to Bawangfen (Today's [[Beijing central business district|Beijing CBD]]) was carried out.  A new branch heading east to a new station, {{stl|BJS|Fuxingmen}}, was completed between {{stl|BJS|Nanlishilu}} and {{stl|BJS|Changchunjie}} stations on December 28, 1987. The section between {{stl|BJS|Changchunjie}} and {{stl|BJS|Beijing Railway Station}} was transferred to the newly created [[Line 2 (Beijing Subway)|Line 2]] and Line 1 ran between Pingguoyuan and Fuxingmen stations. In January 1991, the feasibility study report on the construction of a new line between Fuxingmen to Bawangfen was approved with construction of the new "Fuba line", starting in June 1992. On December 12, 1992, Line 1 was extended east for one station to {{stl|BJS|Xidan}}. In 1994, Line 1's signals were upgraded to [[automatic train protection]] system.<ref name="地铁大事记4">{{cite web |url=http://www.bjsubway.com/node/1838 |script-title=zh:地铁公司1991--2000年大事记 |publisher=Beijing Subway |access-date=2011-02-03 |archive-url=https://web.archive.org/web/20110131123657/http://www.bjsubway.com/node/1838 |archive-date=2011-01-31 |url-status=dead }}</ref> On September 28, 1999, the first section of the Fuba line between {{stl|BJS|Tian'anmen West}} to {{stl|BJS|Sihui East}} was opened. On June 28, 2000, the section between {{stl|BJS|Xidan}} and {{stl|BJS|Tian'anmen West}} stations opened, merging Line 1 and the Fuba Line to create a {{convert|31|km|abbr=on}} line with 23 stations.<ref name="地铁大事记4" />

{| class="wikitable" style="border-collapse: collapse; text-align: right;"
!Segment!!Commencement!!Length!!Station(s)!!Name
|-
|style="text-align: left;"| Gongzhufen — Beijing Railway Station
| 1 October 1969{{efn|name=trial|15 January 1971 - Initial line began operation on a trial basis.}}
| {{convert|10.7|km|mi|2|abbr=on}}
| 10
|style="text-align: left;"| Phase 1 (initial section)
|-
|style="text-align: left;"| Yuquan Lu — Gongzhufen
| 5 August 1971
| {{convert|4.9|km|mi|2|abbr=on}}
| 3
|style="text-align: left;"| Yuquan Lu extension
|-
|style="text-align: left;"| Gucheng — Yuquan Lu
| 7 November 1971
| {{convert|5.4|km|mi|2|abbr=on}}
| 3
|style="text-align: left;"| Gucheng extension
|-
|style="text-align: left;"| Pingguoyuan — Gucheng
| 23 April 1973
| {{convert|2.6|km|mi|2|abbr=on}}
| 1
|style="text-align: left;"| Pingguoyuan extension
|-
|style="text-align: left;"| Nanlishilu — Fuxingmen
|rowspan="2"| 28 December 1987
| {{convert|0.4|km|mi|2|abbr=on}}
| 1
|rowspan="2" style="text-align: left;"| Line 1 & 2 realignment project
|-
| style="text-align: left;" | Changchun Jie — Beijing Railway Station
| {{convert|-6.1|km|mi|2|abbr=on}}
| -6
|-
|style="text-align: left;"| Fuxingmen — Xidan
| 12 December 1992
| {{convert|1.6|km|mi|2|abbr=on}}
| 1
|style="text-align: left;"| Xidan extension
|-
|style="text-align: left;"| Tian'anmenxi — Sihuidong
| 28 September 1999
| {{convert|10.1|km|mi|2|abbr=on}}
| 10
|style="text-align: left;"| Fuba line
|-
|style="text-align: left;"| Xidan — Tian'anmenxi
| 28 June 2000
| {{convert|1.3|km|mi|2|abbr=on}}
| 2
|style="text-align: left;"| Line 1 & Fuba line merging project
|}

{|
|-
| [[Image:Wangfujing station 01.jpg|thumb|220px|left|Line 1 train at Wangfujing in 2007.]]||[[File:East reservation of Xidan Station, Line 1.jpg|thumb|200px|left| In 1992, Line 1 was extended east one station to Xidan.]]||[[Image:Beijing Subway Line 1 Tiananmen East Station.JPG|thumb|200px|left|Platform of Tian'anmen East station]]||
|}

=== Headway Reduction ===
Since 2014, the signaling and power systems has been gradually upgraded to allow for trains to run more frequently.<ref>{{Cite web |title=北京地铁1号线发车间隔有望再快5秒 为世界最快 |url=http://news.sina.com.cn/c/2015-02-05/021931483535.shtml |access-date=2022-06-15 |website=news.sina.com.cn}}</ref> The upgraded CBTC moving block signaling system in place today reduces rush hour headways from every 2 minutes and 5 seconds to 1 minute 45 seconds.<ref name=":0">{{Cite web |script-title=zh:北京地铁1号线、5号线、10号线年底最快两分钟一趟-新华网 |url=http://news.xinhuanet.com/politics/2015-09/26/c_128269673.htm |access-date=2017-12-31 |website=news.xinhuanet.com}}</ref>

===Platform screen doors===
[[File:WUKESONG Station Platform 20181110.jpg|thumb|In 2017, [[platform screen doors]] were installed on the platform of Line 1.]]

Due to platform congestion and suicides, a proposal was made in 2010 to refit all stations on Line 1 with [[platform screen doors]].<ref>{{cite web |url=http://news.sohu.com/20100406/n271336388.shtml |script-title=zh:北京地铁1号2号13号线和八通线将装站台安全门 |publisher=[[Sohu]] |date=2010-04-06}}</ref> However, the ventilation system in the older stations of Line 1 was incompatible with full-height [[platform screen doors]], so half height platform screen doors were chosen instead.<ref>{{cite web |url=http://www.dzwww.com/rollnews/news/201007/t20100704_6274883.htm |script-title=zh:北京地铁老线加装站台安全门已进入论证阶段 |access-date=2013-03-09 |archive-url=https://archive.today/20130410182501/http://www.dzwww.com/rollnews/news/201007/t20100704_6274883.htm |archive-date=2013-04-10 |url-status=dead }} 大众网 2010-07-04</ref>  In July 2016, the operator began installing platform screen doors on Line 1.<ref>{{cite web|url=http://www.chinadaily.com.cn/beijing/2016-07/19/content_26157367.htm|title=Beijing begins installing platform barriers on subway Line 1|agency=[[Xinhua]]|work=[[China Daily]]|date=2016-07-19|access-date=2019-07-11}}</ref> In 2016, the [[platform screen doors]] was installed at [[Yong'anli station]].<ref>{{Cite web|url=http://jiangsu.china.com.cn/html/finance/finances/6952635_1.html|script-title=zh:北京地铁1号线站台门 开关2000次后"上岗" - 财经新闻 - 中国网•东海资讯|website=jiangsu.china.com.cn|access-date=2016-08-18|archive-url=https://web.archive.org/web/20160821050436/http://jiangsu.china.com.cn/html/finance/finances/6952635_1.html|archive-date=2016-08-21|url-status=dead}}</ref> By the end of 2017, all stations except {{stl|BJS|Pingguoyuan}} were retrofitted with half-height platform screen doors, and all the screen doors were put into operation for the first time.<ref>{{Cite web|url=http://news.sina.com.cn/c/2017-09-10/doc-ifyktzim9373761.shtml |script-title=zh:1号线全线安全门今日投用 北京地铁全线安全门全部启用|website=news.sina.com.cn |date=2017-09-10 |access-date=2017-11-09}}</ref>

===Through operations with the Batong line===
[[File:LCD route display on 01 0366 (20210527174608).jpg|thumb|Route display reserved for through service from Pingguo Yuan to Universal Resort]]
In 2010, a CPPCC member Chen Dingwang, proposed that services on Line 1 and the [[Batong line]] should directly link, with [[Through train|through operations]], reducing travel times and removing the unnecessary forced transfers at {{stl|BJS|Si Hui Dong(E)}} or {{stl|BJS|Si Hui}}.<ref>{{cite web |url=http://www.china.com.cn/economic/txt/2011-09/16/content_23426447.htm |script-title=zh:北京地铁八通线一号线有望贯通 |publisher=中国网 |date=2011-09-16}}</ref> However, the [[Beijing Subway]] responded that Line 1's and Batong's [[Railway signalling|signal]] systems are completely different, so through-operation will be more difficult to achieve, from an engineering standpoint. As of 2016, preliminary design and feasibility studies are underway to allow for through operations between Line 1 and Batong.<ref>{{Cite web|url=http://finance.qianlong.com/2016/1114/1109977.shtml |script-title=zh:北京八通线南延工程初步设计顺利通过评审-千龙网·中国首都网|website=finance.qianlong.com|access-date=2016-11-17}}</ref> On June 12, 2020, the project of the through operation of Line 1 and Batong line was approved by Beijing Development and Reform Commission.<ref>{{cite web|url=http://fgw.beijing.gov.cn/fgwzwgk/ysqzzdgk/202006/t20200612_1923647.htm|title=关于轨道交通1号线与八通线贯通运营工程项目建议书（代可行性研究报告）的批复|work=Beijing Development and Reform Commission|date=2020-06-12|access-date=2020-06-19}}</ref> [[Through operation]] with the [[Batong line]] started on 29 August 2021.<ref name=bjd20210825>{{cite news|url=https://news.bjd.com.cn/2021/08/25/159146t100.html|title=四惠四惠东站无须换乘了！北京地铁1号线、八通线本周日跨线运营|work=[[Beijing Daily]]|date=2021-08-25|accessdate=2021-08-25|archive-url=https://web.archive.org/web/20210825092946/https://news.bjd.com.cn/2021/08/25/159146t100.html|archive-date=2021-08-25}}</ref>