http://en.wikipedia.org/wiki/MV_Caribou
Not exactly mine, but I go on it sometimes. and quite a few of my relatives work on it.
Beats your ferry
It holds 1200 passengers and 370 vehicles. It also has 4 MAK 8 Cly diesel engines, each one generating 7000 bhp (24000 bhp total) and 3 auxiliary MAK 8 cly diesel 2400 bhp. The length is 179 metres and displacement is 27,212 tons.
I love it. If I can recall it is the largest ice breaking ferry in Nort America.
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