In other articles it been noted that CN is also ordering another 350 lumber (centerbeam) flatcars. The flatcars will be built by NSC; I haven't seen any articles yet that actually indicate who's building the boxcars.
These articles are also all noting the 50 to 60 new locomotives on order from GE as well. Currently CN is quite colourful being awash in a variety of CitiCorp (CREX), ProgressRail (PRLX) and GE (GECX) leasers to take up the slack with the current power shortages.
Over on CP, they've started re-activating a bunch of retired SD40-2s.