Sorry for the late reply on this one. Blame old age. Borden was used as a passing siding. Wilson could be used, however there was only a signal at the north end of the siding. Special instructions in the 1964 timetable instructed that, if used, the northbound train had to take siding, and that the southbound train had to stay north of the north switch until the northbound train was in the clear and switch closed.
Rick