Pacific Electric acquired the Ontario and San Antonio Heights Railroad Company on April 13, 1912,[1] bringing their Euclid Avenue Line in Upland as well as their branch to Pomona into the interurban network.

[2] Connections to main line steam trains were made at Ontario Southern Pacific Station.

[3] The line operated with an irregular schedule between Ontario and Upland until service was abandoned after October 6, 1928.

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