A vegetation fire sparked near Rose Canyon Open Space Park Thursday, San Diego Fire-Rescue officials said.
The fire, reported just before 2 p.m., was located near Porte De Merano and Regents Road, on the south side of the tracks, according to officials.
Video from SkyRanger7 showed ground crews tackling the fire which burned about an acre of brush.
Homes were located on the opposite side of the railroad tracks from the fire.
San Diego Fire-Rescue officials said the fire was stopped by copter drops and firefighters.
No one was injured.
By 2:30 p.m., train service resumed.
The area is east of Interstate 5 and north of State Route 52 in the University City neighborhood.