I don't know what the original poster meant, but here's a possible explanation. You're talking about the transit line itself, but for investments, it's all about property alongside the corridors, especially any piece of property big enough to knock down whatever's there and build a condo on it. These can indeed be long-term investments, because someone who bought property along Eglinton before 2010, when the route was first approved, or even proposed and just an idea on a drawing board, is still waiting for their investment to mature. Also, I can well imagine people buying property along a road where no transit line is planned yet, but could be, and then lobbying the government to build transit along the road where their property exists. This also counts as investment activity. And all this long term investment could involve laundering money, but identifying where exactly it's happening is way beyond the scope of this discussion.