In my neck of the woods (east Toronto), CN used to run the following intermodals (please note these are not the only intermodals in this corridor):
136 Toronto - Halifax
137 Halifax - Toronto
146 Chicago - Auburn (Maine via SLA)
147 Auburn - Chicago
148 Chicago - Halifax
149 Halifax - Chicago
My recollection is that these would typically handle 80 - 100 trailers and containers per day... so lets say 240 - 300 loads per day. Along comes the IC and the "Chicago Outfit" with the bright idea to combine these trains into one massive intermodal between Chicago and Halifax, trains 148/149. These are basically long distance locals that work Durand, MI., Toronto (Brampton), ON., Belleville, ON., Montreal, PQ., Quebec City, PQ., and Moncton (but I'm not sure). At Quebec City and Belleville, 149 will lift loads of aluminum from Alcan in Arvaida, PQ.
Not too surprising that the "new" 148/149 typically have 100 - 150 trailers and containers per day... sometimes as few as 30! Nice job guys, 240-300 loads per day to 100-150. They are killing the Port of Halifax to the benefit of CP in Montreal, and NS/CSX in Boston, NY, Philly... etc (though big savings in crew calls and locomotive utilization). Service is pretty bad when you run one train to Chicago each day that does the work of two others as well. There is a 120/121 still runs Toronto - Halifax, but I think that is it for intermodals.
Now IC... er, CN is going to somehow blossom the Port of Prince Rupert, BC into some super container terminal to take advantage of it's proximity to China? Right, 10,000 ton intermodal with two units and an average speed of 17mph that will likely work Jasper, Edmonton, Winnipeg, N Fon du Lac, and whatever else lies between. Maybe they can fill her out with 5000 tons of grain somewhere is Saskatchewan, too! Halifax is the closet mainland deepwater port in North America to Europe and CN is pooping that down the drain.
IMO, from what I've seen they either don't care about intermodal, or they figure that treating them like manifest freight is a good way of keeping and growing the business. I doubt anything will change until they get the IC guys out of the management of the RR. Maybe some ex AT&SF or BNSF guys could rebuild the intermodal side of CN. Santa Fe did alright as an intermodal road, and CN is blessed with so much carload freight, you'd think they'd do a better job with containers. It seems that CN does alright in the intermodal trade between Montreal/Toronto and Western Canada (five daily trains, IIRC), but not so good in the Halifax - Chicago and on the ex IC side, and I see from pictures on the internet that CN Vancouver - Chicago intermodal trains look like manifest freights more than anything else.
CN is pretty darn good at moving carload freight, however.
End rant.