Brian Porter (705 272-8268) in Cochrane, you can pick him up on your way to Mattice, he will take your vehicle and securely park it at his home just south of Cochrane. When you get to Moosonee you can let him know which day you will be on the train and he will bring your vehicle to the station so it's there when you get off the train. If you leave a vehicle at the Cochrane train station for more than 48 hours you will get tagged and possibly towed.
In August (especially this year) the Moose after Moose River Crossing can be very shallow, quite a few people exit early at this point.
The tidal effects reach as far upstream as about the North French, maybe as far as the Abitibi, that could be an easy 2 - 3 hours or a miserable 6+ hours from the takeout in Moosonee depending your timing and made worse if you are going against the wind as well. Definitely jot down the high tide times for the Moosonee gauge for the 2 or 3 day period around your expected arrival. The less water coming down the Moose the more impact the tides will have and the greater the chance of dealing with a "no water" situation such as this if your timing is off.....
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