Join Date: May 2006
Location: MYF/CMA/SAN
Programs: COdbaUA MM, AA EXP, AF G, Bonbon Gold, Hilton G, All G, GHA Titanium, Hertz PC, Avis Presidential
Posts: 5,929
Even with bags, I'd lean toward the train, and just carry-ons makes this a no-brainer. Take the train.
As for customs, they really won't care. Indeed, you are a citizen of Canada, so the CBSA really has no interest in grilling you beyond your duty free allowance.