The 46 goes from the Oakville carpool lot to the Oakville GO station. It runs from Oakville GO to York University via Square One, etc.
Sometimes, although not often anymore because of the 30 minute Aldershot service, it makes sense to do: 47 to Oakville carpool -> 46 to Oakville GO.
Basically, as has been discussed already, you take the 15 to Aldershot GO, wait 15 minutes for the train to leave then get off at Oakville.
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