ION - Waterloo Region's Light Rail Transit

[timc]

On the subject of Waterloo Park-Laurier, I watched a bit of the paving work they were doing last week on Seagram. I saw one of the guys pouring some black goop from pails into the gap between the pairs of gauntlet track. I didn't know what it was, but when I went by today, it looked like some kind of hardened black resin instead of asphalt in the narrow gaps. Does anyone know what that is? It looks like it will be more durable than asphalt in the narrow gaps.