Hospital Center Line

Route D8 operates daily between Washington Union Station and MedStar Washington Hospital Center connecting the hospital centers and Metrorail stations. The line also connects small neighborhoods to Metrorail stations. Route D8 currently operates out of Bladensburg division.

In the Hospital Complex, Only northbound buses from Union Station stop at Washington Hospital Center and the Veterans Affairs Medical Center. Buses travel once through Washington Hospital Center. Passengers that are wishing to go southbound from Washington Hospital Center would get on a northbound bus, which will turn into a southbound bus to Union Station at the 1st Street terminal, and proceed directly on 1st Street to Michigan Avenue.

Route D8 originally operated between Friendship Heights and Distaff Hall (Army Distaff Foundation Inc) until the 1970s.

Route D8 was created as a new route on June 4, 1977 to operate between Washington Hospital Center and Sibley Hospital alongside route D6, via the Hospital Complex, Trinity University, Glenwood Cemetery, the Edgewood Terrace Apartments, the Rhode Island Avenue Shopping Center, the Rhode Island Avenue–Brentwood station, Washington Union Station, Judiciary Square, Metro Center, and Dupont Circle stations.{{Cite news|url=https://www.washingtonpost.com/archive/local/1977/06/04/metrobus-to-change-routes-for-dupont-circle-new-hospital/b32e5732-d861-43fd-9029-b55c2debddb3/|title=Metrobus to Change Routes for Dupont Circle/New Hospital|last=|first=|date=June 4, 1977|newspaper=Washington Post|archive-url=|archive-date=|access-date=November 21, 2019}}

When Dupont Circle station opened on January 15, 1977, both routes D6 and D8 did begin serving Dupont Circle in the middle of their routes. No changes were made in their route.

In March 1995, the line was split into two routes in order to simplify the line.

Route D6 was split to operate between Sibley Hospital & the Stadium–Armory station, via Washington Union Station, instead of operating to Washington Hospital Center in order to replace the segment of the former routes 40, 42, and 44 between Union Station and Stadium–Armory station when both 40 and 44 were discontinued and 42 was shortened to operate between Mount Pleasant and Metro Center station.{{Cite news|url=https://www.washingtonpost.com/archive/local/1995/02/02/proposed-cuts-in-bus-routes-outlined/1ff6bfba-6288-4acf-bcb3-19689bafef19/|title=Proposed Cuts in Bus Routes|last=Harris|first=Hamil|date=February 2, 1995|newspaper=Washington Post|archive-url=|archive-date=|access-date=November 21, 2015}}

Route D8 was also split to only operate between Washington Hospital Center Washington Union Station. The segment of D8's routing west of Union Station was replaced by routes D1, D3, and D6. At the same time, the D8 replaced the segment of D6's former routing between Union Station and Washington Hospital Center, via Rhode Island Avenue–Brentwood station.

As a result, as route D6 became a part of the Sibley Hospital–Stadium Armory Line, which operated alongside routes D1 and D3 while route D8 became a part of the Hospital Center Line.

In 2014, WMATA proposed to shorten the D8 to Rhode Island Avenue station and to have a new Route D7 to operate between Rhode Island Avenue and the hospital campus in order to Improve reliability of service by operating shorter routes, Reduce the number of buses operating on the congested hospital roadways, and Create a better balance of capacity and demand throughout the line.{{cite web |title=DISTRICT OF COLUMBIA PROPOSED BUS SERVICE CHANGES |url=https://www.wmata.com/about/public-hearings/upload/DC_Docket.pdf |accessdate=17 February 2020}}

During the COVID-19 pandemic, the route was reduced to operate on its Saturday supplemental schedule during the weekdays 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}} On March 18, 2020, the line was further reduced to operate on its Sunday schedule.{{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 later suspended on March 21, 2020.{{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}} Additional service and weekend service was restored on August 23, 2020.{{cite web |title=August 2020 Metrobus Service Changes, August 23 {{!}} WMATA |url=https://www.wmata.com/service/status/details/proposed-august-2020-metrobus-service-changes.cfm |website=www.wmata.com |accessdate=28 July 2020}}

In February 2021, WMATA propose to eliminate the D8 if they not get any federal funding.{{cite web |title=FY22 Proposed Metrobus Service Changes District of Columbia |url=https://www.wmata.com/initiatives/budget/upload/Proposed-DC-Bus-Changes.pdf |access-date=25 March 2021}}

As part of WMATA's Better Bus Redesign beginning on June 29, 2025, the D8 was merged with the D4 and was renamed into the D36. The route follows the former D8 routing between MedStar Washington Hospital Center and K Street NE, but was rerouted to serve Franklin Square along the D4 routing. Service to Washington Union Station was replaced by the C71, which was a combination of the D4 and E2, except it turns onto North Capitol Street from K Street NE and serves Washington Union Station.{{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}}

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D8