Takoma–Fort Totten Line

Route K2 operates between Fort Totten and Takoma stations during weekday peak hours only in both directions. Additional K2 trips operate at 1:34 pm when public schools are open. This route connects Fort Totten and Takoma residents via Lamond without having to take the expensive train during the peak-hours. Route K2 currently operates out of Bladensburg division but has operated out of Northern division at one point.

Route K2 was created as a brand new route by WMATA on February 19, 1978, to operate during the weekday peak-hours between the newly opened Fort Totten station and Takoma stations, plus to the Walter Reed Army Medical Center in the Shepherd Park neighborhood of Northwest Washington D.C.{{Cite news|url=https://www.washingtonpost.com/archive/local/1978/02/19/major-bus-route-changes-set-tuesday/69da288d-2195-4473-b3d9-6932ffc44ed9/|title=Major Bus Route Changes Set Tuesday|last=Feaver|first=Douglas B.|date=1978-02-19|work=Washington Post|access-date=2019-11-25|language=en-US|issn=0190-8286}} The new route will connect hospital workers to various to Metrorail stations without having to walk.

Route K2 will operate in a clockwise loop between Takoma and Walter Reed Army Medical Center during the AM peak-hours and a counter clockwise loop during the PM peak-hours and operate in both directions between Takoma and Fort Totten stations. Only hospital workers with a valid I.D. are allowed to ride inside the Walter Reed Army Medical Center. Passengers wishing to board/alight at the Medical Center would had to get off of stops along Georgia Avenue. The route only operates between Fort Totten and Takoma stations during the peak hours in the non peak direction.

On March 27, 2005, the K2 was split into two routes. The K2 loop between the Takoma station and Walter Reed Army Medical Center was renamed under a route K1 under the Takoma–Walter Reed Line. The new K1 will operate during the weekday peak-hours only and operate under the clockwise and counter clockwise loops the K2 had plus had the same restrictions at the Walter Reed Army Medical Center loop.{{cite web |title=Metrobus service to change on March 27, 2005 |url=http://www.wmata.com/metrobus/032705_service_changes.cfm |date=March 27, 2005 |accessdate=June 15, 2020 |archive-url=https://web.archive.org/web/20051108161603/http://www.wmata.com/metrobus/032705_service_changes.cfm |archive-date=November 8, 2005 |url-status=dead }}

Route K2 would only operate its routing between Takoma station and Fort Totten station during the weekday peak-hours only.{{Cite web|url=https://www.wmata.com/about/news/pressreleasedetail.cfm?ReleaseID=3284#main-content|title=Metro News Release {{!}} WMATA|website=www.wmata.com|access-date=2019-11-25}} The route has not had any major changes since.

All K2 service was suspended beginning on March 16, 2020, due to the COVID-19 pandemic.{{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}} Service resumed 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}}

In February 2021, WMATA proposed to eliminate all K2 service if they did 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 K2 was renamed into the C77, keeping the same routing.{{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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K2

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