I'm pretty sure that the Arbutus ROW dates back to around 1900. Even before the brewery, the tracks served an important purpose for CP. Great Northern and Canadian Northern built the Granview Cut and basically claimed all the land the fill created in the False Creek Flats. This cut the Burrard peninsula in half, and CP's main line was to the north. CP had the North side of False creek and wanted access to the mills and industry on the south side. Before all the apartments were built and before the brewery, the south side of False Creek was covered with industry. They built a trestle across False Creek and the ROW down Arbutus. This allowed the central CP yards in Yaletown access to the industry on the South Side of False Creek and the industry along the Fraser River without the CP tracks having to physically cross the GN/CN tracks. They could bring freight from mills on the Fraser River to the ports on Burrard Inlet without having to go through New Westminster. I believe freight trains (and not just from the brewery) crossed the Kits Trestle until it was dismantled before Expo.
While trying to find some dates for my post I ran across this report from Richmond.
http://www.richmond.ca/__shared/assets/021400_item81028.pdf
Its from 2000 and is in regard to the Arbutus corridor and refers to a report by BC Transit about the RAV line done in 1990. The attached map of transit lines, from about 2000, is interesting to note. It includes Translink's phases of the Millennium line that it thought were a sure thing. It's interesting how plans seem to constantly change in Vancouver. First RAV was the priority, then Millennium, then cut that project in half, then build RAV, not maybe back to the other phases of the Millennium line.
If we didn't spend so much time arguing over which one should be done first, they would probably all been done by now.