A protest over a pipeline is shutting down train service across much of Canada

Demonstrators stand near railway tracks during a protest near Belleville, Ontario, on Thursday.

(CNN)Protesters blocking Canadian railways have shut down large portions of the nation's passenger and freight train service this week, knocking out a travel option for thousands and spurring a business group to warn the cross-country flow of food and other goods will slow.

The protests started last week when police started arresting members of an indigenous group that was blocking a road to a construction site for the Coastal GasLink natural gas pipeline in British Columbia, CNN network partner CTV reported.
Indigenous groups and allies blocked railways and government buildings around the country in solidarity with the British Columbia group. Some rail blockades have ended, but others remain, including near Belleville, Ontario.
Because of the remaining blockades: