Between April and June 1928 the service was through-routed was with the San Bernardino–Riverside Line as part of a scheme developed by the California Railroad Commission;[5] this was reverted after proving unsuccessful.

By 1940, the line was the only Pacific Electric service to not operating in Los Angeles County, running isolated from the rest of the system.

The line continued through Arlington to La Sierra, then crossed the Atchison, Topeka and Santa Fe Railway Third District (now the BNSF San Bernardino Subdivision) tracks at grade (at May) at present Corona City limits.

The line in private way on Magnolia Avenue continued to Porphyry (Home Gardens) which was an interchange junction with the ATSF.

The line turned westerly and ran to the Corona Civic Center where Magnolia Avenue ended.

After the Great Merger of 1911, surveys were carried out to establish two routes through the canyon — one on each side of the Santa Ana River.