Eastover–Addison Road Line

Route P12 operates daily between Addison Road station and Eastover Shopping Center via Southern Avenue station and Suitland station. The line mostly provide service along Addison Road, Silver Hill Road and Iverson Street connecting many neighborhoods to various Metrorail stations. The P12 operates every 12 minutes between 7AM and 9PM and 30 minutes after 9PM.

Route P12 currently operates out of Landover division.{{Cite web|url=http://talk.nycsubway.org/perl/read?bustalk=60166|title=Re: WMATA Roster Project (WRP) Info and Roster (60166)|website=talk.nycsubway.org|access-date=2019-11-06}}

Route P12 was created as a brand new bus route by the WM&A Bus Company in 1965, to operate as part of the District Heights-Silver Hill Road Line between the Eastover Shopping Center in Forest Heights, Maryland and the intersection of Shady Glen Drive and Central Avenue along Walker Mill Road.{{Cite web|url=https://www.chicagorailfan.com/wasdatem.html|title=WASHINGTON DC TRANSIT ROUTES|website=www.chicagorailfan.com|access-date=2019-11-06}} P12 was eventually converted into a WMATA Metrobus Route on February 4, 1973, when WMATA acquired all four bus companies that operated throughout the Washington D.C. Metropolitan Area and merged them to form its own Metrobus System.{{cite web |title=History |url=https://www.wmata.com/about/history.cfm |accessdate=20 May 2020}}

On December 3, 1978, route P12 was extended from its original terminus at the intersection of Shady Glen Drive & Central Avenue to Deanwood station beginning on December 3, 1978. The name of the P12 was also changed to the Eastover–Deanwood Line.{{Citation |last=Feaver |first=Douglas B. |title=Orange Line brings Metro to Beltway; Orange Line will bring Metro to P.G. |date=November 12, 1978 |newspaper=The Washington Post |page=C1}}{{Citation |last=Eisen |first=Jack |title=City-County fanfare opens Orange Line; Ceremonies open new Orange Line |date=November 18, 1978 |author2=John Feinstein |newspaper=The Washington Post |page=D1}}{{Cite web|url=https://www.washingtonpost.com/archive/local/1978/11/30/bus-routes-change-sunday-to-link-with-orange-line/74b7bfbd-4100-411b-b9eb-d51f9e4a0031/|title=Bus Routes Change Sunday to Link With Orange Line|last=Feaver|first=Douglas|date=November 30, 1978|website=Washington Post|access-date=November 6, 2019}}

On January 4, 1981, two months after the Addison Road station opened, route P12 discontinued service to Deanwood station and instead terminate at Addison Road station. Route P14 and R12 would replace the P12 between Deanwood and Addison Road stations operating along the former P12 routing. The only changes route P12 would also have was that the P12 would operate along Central Avenue to Shady Glen Drive, then turn onto Shady Glen Drive to the Eastover Shopping Center and vice versa to Addison Road. The line was then renamed the Eastover–Addison Road Line.{{Cite news|url=https://www.washingtonpost.com/archive/local/1981/01/01/bus-route-changes-start-this-weekend/58085348-5073-4756-994c-160ea25c8d50/|title=Bus Route Changes Start This Weekend|work=Washington Post|access-date=2019-11-06|language=en-US|issn=0190-8286}}

On January 13, 2001, when both Suitland and Southern Avenue stations opened, P12 went through a minor rerouting change to divert to Suitland and Southern Avenue stations.{{cite web |url=http://wmata.com/metrobus/servicechange_011301_md.htm |title=Metrobus service changes effective January 13, 2001 Maryland |date=February 10, 2001 |accessdate=June 15, 2020 |archive-url=https://web.archive.org/web/20010210013516/http://wmata.com/metrobus/servicechange_011301_md.htm |archive-date=February 10, 2001 |url-status=dead }}

In 2014, it was proposed for the P12 and V12 to swap routings between Addison Road station and the intersection of Addison Road and Walker Mill Road which will provide a more direct route for the P12 as the V12 is focused to become a neighborhood focused route. Also P12 was also proposed to terminate only at Southern Avenue station with a brand new P10 service operating between Southern Avenue and Eastover Shopping Center but discontinue service at United Medical Center with alternative service provided by the A2, W2, and W3.{{cite web |title=MARYLAND PROPOSED BUS SERVICE CHANGES FISCAL YEAR 2015 |url=https://www.wmata.com/about/public-hearings/upload/MD_Docket.pdf |accessdate=7 November 2019}}

This was because discontinuing service through United Medical Center property will save time and increase reliability, since buses will make fewer turns and will no longer get stuck behind illegally parked vehicles at the hospital entrance, swapping P12 and V12 routing on Walker Mill Road and Shady Glen Drive will provide a more direct route for the P12 as the V12 is already designed to be a more neighborhood-focused service, and splitting the P12 route at Southern Avenue Station will increase reliability and on time performance plus also provides the flexibility to focus future resources on the portions of the line with the highest demand. According to Performance Measures, only 11% of passengers on the route travel through Southern Avenue Station, the route averages approximately 52 passengers per hour on weekday, and 41 passengers per hour on Saturdays and Sundays north of Southern Avenue Station, and the route averages approximately 58 passengers per hour of weekdays, 54 passengers per hour on Saturdays and 56 passengers per hour on Sundays south of Southern Avenue Station.

On June 21, 2015, routes P12 and V12 swapped its routing between the intersection of Addison Road and Walker Mill Road and Addison Road station. Route P12 would operate along Addison Road while route V12 would operate along Shady Glen Drive, Walker Mill Road, and Central Avenue. Also, route P12 discontinued service into United Medical Center and instead serve bus stops along Southern Avenue. As a result of these changes, route P12 also became a more direct route while route V12 a neighborhood-focused route which was WMATA's "Better Bus Service" initiative program's goal.{{cite web |url=http://wmata.com/rider_tools/metro_service_status/advisories.cfm?AID=4948&t=bus |title=Metrobus Service Changes Beginning June 21 |date=June 21, 2015 |accessdate=June 27, 2020|archive-url=https://web.archive.org/web/20150613080640/http://wmata.com/rider_tools/metro_service_status/advisories.cfm?AID=4948&t=bus|archive-date=June 13, 2015|url-status=dead}}{{cite web |last1=Levine |first1=Ethan |title=Metrobus Service, Schedule Changes to Take Effect Sunday |url=https://patch.com/maryland/bowie/metrobus-service-schedule-changes-take-effect-sunday-0 |website=Bowie, MD Patch |accessdate=25 May 2020 |language=en |date=19 June 2015}}

During the COVID-19 pandemic, route P12 operated on its Saturday supplemental schedule beginning on March 16, 2020.{{cite web |title=Metro announces additional COVID-19 changes, including reduced service beginning Monday {{!}} WMATA |url=https://www.wmata.com/about/news/Metro-announces-additional-COVID-19-changes.cfm |website=www.wmata.com |access-date=31 January 2021}} It however began operating on its Sunday service on March 18, 2020.{{cite web |title=METRO SERVICE LEVELS & HOURS FURTHER REDUCED TO SUPPORT ESSENTIAL TRIPS ONLY, STARTING WEDNESDAY {{!}} WMATA |url=https://www.wmata.com/about/news/METRO-SERVICE-FURTHER-REDUCED-TO-SUPPORT-ESSENTIAL-TRIPS-ONLY.cfm |website=www.wmata.com |access-date=31 January 2021}} Weekend service was also reduced to operate every 30 munutes.{{cite web |title=Weekend: Metro service limited to 26 bus routes, reduced rail service; expect wait times of 30 minutes; customers urged to travel only if essential {{!}} WMATA |url=https://www.wmata.com/about/news/Weekend-service-3-28-3-29.cfm |website=www.wmata.com |access-date=31 January 2021}} Its regular service was restored on August 23, 2020.{{cite web |title=Metrobus Service Changes beginning August 23 {{!}} WMATA |url=https://www.wmata.com/service/status/details/proposed-august-2020-metrobus-service-changes.cfm |website=www.wmata.com |access-date=31 January 2021}}

On September 5, 2021, service was increased to operate every 12 minutes daily between 7 a.m. to 9 p.m.{{cite web |title=Improved frequency and changes to Metrobus service begin Sunday, Sept. 5, 2021 |url=https://www.wmata.com/service/status/details/metrobus-service-changes-september-2021.cfm |access-date=16 August 2021}}

On January 12, 2025, all service in the Forest Hill Apartments were eliminated with service being rerouted along Southern Avenue SE. This is due to a cease-and-desist complaint letter from the owner of Forest Hill Apartments.{{cite web |title=Metro discontinues eight P12 bus stops after cease-and-desist demand from property owner |url=https://www.wmata.com/about/news/Metro-discontinues-eight-P12-bus-stops-after-cease-and-desist-demand-from-property-owner.cfm |access-date=7 January 2025}}

As part of WMATA's Better Bus Redesign beginning on June 29, 2025, the P12 was split into two routes. The P12 route portion between Addison Road station and Suitland station was combined with the A12 and renamed to the P60. The P12 route portion between Suitland and Eastover Shopping Center was made into Routes P93 and P94. The P93 operated between Suitland and Birchwood City via Livingston Road while the P94 operated between Suitland and National Harbor via Livingston Road and Oxon Hill Park & Ride. The P12 designation was given to the former 89M route.{{cite web |title=Metro Board of Directors approves Better Bus Network Redesign, new bus routes to start next summer |url=https://www.wmata.com/about/news/Metro-Board-of-Directors-approves-Better-Bus-Network-Redesign-new-bus-routes-to-start-next-summer.cfm |website=WMATA |access-date=23 January 2025 |language=en}}

• On April 29, 2022, a person was stabbed to death after he got into an altercation with another person on board a P12 bus near Southview Court and Southview Drive in Oxon Hill.{{cite web |last1=Willis |first1=Carl |title=1 man killed in stabbing in Prince George's County after fight on D.C. Metrobus |url=https://wjla.com/news/local/dc-metrobus-stabbing-man-killed-aboard-prince-georges-county-suspect-in-custody-glassmanor-wmata |website=WJLA |access-date=17 May 2022 |language=en |date=29 April 2022}} The suspect was charged with second-degree murder on May 4, 2022.{{cite web |title=Metrobus fight leads to fatal stabbing in Oxon Hill; suspect, victim identified |url=https://www.fox5dc.com/news/metrobus-fight-leads-to-fatal-stabbing-in-oxon-hill |website=FOX 5 DC |access-date=17 May 2022 |date=29 April 2022}}

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