A January 1936 inventory of the line notes:
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Tonquin – M.P. 18.8
Concrete sub-station. Fair condition. Operator’s house. Leased to outside party. Freight house. Dilapidated condition. Seldom used. Passing track, length 1380 ft. 70#. Team track, length 453 ft. 70#.
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Authorization for Expenditure (AFE) E-2892, dated December 5, 1944, authorized the retirement of all eight substations on the Oregon Electric network — including Tonquin — in preparation for the total abandonment of electric traction on July 10, 1945.
AFE E-2958 of February 8, 1946, authorizes the sale of the “agent’s cottage.”
Tonquin substation c. 2000. Photo taken for HAER Survey: OR-113 – Oregon Electric Railroad (Wilsonville to Garden Home Section) Clackamas County. Photo from the Library of Congress.
Only the shell of the substation building remains today – see the entry in the “Remnants” section of the site: Tonquin Substation (Oregon Electric)