I found the same thing, and I put a glass factory in Brantford for it.
Every load I have done has had the GT lay its tracks last, which is something I wanted because historically the GT only came about in 1855. There was a couple of smaller RRs that never went anywhere.
My experience has had the D&H go tanking every time. So after observing a few different loadings of the game, (okay, probably about 30), I have made a number of changes to the map.
Besides the glass factory at Brantford...there is sand and coal to the south of it, I have also expanded the area for logging camps in SWO. I also put a textile mill to spawn at Woodstock. Stratford also gets a farming community in 1850. This should boost the overall economy of the area.
I've made a few other changes to the events, i.e. explained the requirement for takeover earlier, and I've also been adding the bonuses to get some cash to the players based on accomplishments.
One thing I found is that if you jump from the STL&C over to the GT, and you have a lot of bonds, the AI will issue a whack of stock to pay the bonds down, and you end up getting margin calls.
I should have a new version of the map finished in a few hours. I am currently checking over the events and tidying up the dialogs.