The
Ontario and San Antonio Heights Railroad Company opened the line On January 1, 1911 as their second route after the
Ontario–San Antonio Heights Line. After Pomona Junction, cars ran over Pacific Electric tracks to the center of Pomona. Cars were initially interlined with the
Upland–Ontario Line. Service east of Claremont ended in November 1918, which also ended the through-routing. One trip was extended to Upland starting in 1922. By the end of its life in 1932, many trips were
short turn shuttles running between Pomona and North Pomona with transfers to the San Bernardino Line. ==Route==