The Federal Court of Appeal has dismissed the legal challenge to Ottawa’s decision to approve the Trans Mountain pipeline expansion a second time. In a unanimous, 3-0 decision, the court dismissed four challenges to the approval filed last summer by First Nations in British Columbia. The decision paves the way for construction to continue on the project, though the First Nations have 60 days to appeal to the Supreme Court. The expansion project would triple the capacity of the existing pipeline between Edmonton and a shipping terminal in Burnaby, B.C., with the new pipeline carrying mainly diluted bitumen for export.