Metro will implement route changes Sunday affecting several Maryland lines. The routes to be changed are:

Route H11 (Marlowe Heights Line). New schedules for evening service will be in effect. New timetables listing departure times from the Potomac Avenue Metro station will be available.

Routes H12 and H14 (Marlowe Heights Line). The first discharge stop for outbound trips from 4 to 6:30 p.m. will be Fairfax Village (38th and Alabama Ave. SE.)

Route J14 (Marlboro Pike Line). The first discharge stop for outbound trip from 4 to 6:30 p.m. will be Fairfax Village (38th and Alabama Ave. SE).

Route K12 and K19 (Forestville Line). The first discharge stop from Potomac Avenue station between 4 and 6:30 p.m. will be at Fairfax Village (Pennsylvania and Alambama avenues Se).

Routes L3 and L9 (Connecticut Avenue Line). An extra trip from Aspen Hill will be added, with other trips adjusted slightly between 7 and 7:40 a.m. weekdays. Trips leaving 13th and Pennsylvania NW between 4:25 and 5:06 p.m. will be adjusted to balance passenger loads.

Route T2 (River Road Line). The 3:39 p.m. trip from Congressional Country Club will be rescheduled to leave from Montgomery College; trips leaving Dupont Circle station between 5:50 and 8:42 a.m. will be adjusted slightly; the 4:20 trip from Dupont Circle will leave instead at 4:30 p.m.

Route T4 and T6 (Bethesda-Rockville Line). New schedules will be implemented Monday. The last currently scheduled Sunday trips in each direction will be eliminated.

Route T18 (Annapolis Road Line). All trips will be rerouted via Emerson House. The new routing will be: Inbound and outbound trips will operate as today until the intersection of 57th Avenue and Emerson Street, then right on Emerson Street, right on the Emerson House entrance, continue along the apartment roadway, then left on Emerson Street, left on 58th Avenue and then via regular route.

Information about these route adjustments can be obtained by calling 637-2437. New timetables are available by mail by calling 637-1261.