The Crosstown Line, designated Routes H2 and H4, is a daily bus route operated by the Washington Metropolitan Area Transit Authority between Brookland–CUA station and Tenleytown–AU station of the Red Line of the Washington Metro.

Both routes connect Brookland and Tenleytown stations by bus without having to take the Red Line.

[3] The line was later acquired by DC Transit in 1956 and later diverted to serve the Washington Hospital Complexes along 1st Street.

Service to Westmoreland Circle and along Yuma Street was replaced by a new route N8 which will operate between Van Ness and Wesley Heights.

The new N8 solves the noise complaint problem by using smaller and quieter 30 ft buses.

The main difference is route H3 would not serve the Hospital Complexes along 1st street and instead remain along Michigan Avenue.

[8] In 2010 during WMATA's FY2011 budget year, WMATA proposed to reroute route H2 back to Tenleytown–AU station discontinuing service to Van Ness–UDC station in order to replace route N8 which is proposed to be eliminated due to declining ridership.

Routes L1, L2, and L4 took over the discontinued portion of the H2 along Connecticut Avenue but there was no alternative service is provided on Reno Road.

[15] In September 2020, WMATA proposed to eliminate all route H3 service due to low federal funds.

[16] Later in February 2021, due to low federal funds, WMATA proposed to reroute the H2 and H4 to Friendship Heights station via Connecticut Avenue NW north of Calvert Street NW to replace the L1 and L2 beginning in January 2022.