Flooding in southern B.C. continues to present logistical challenges for exporters as Canadian National Railway shut its service along the key freight corridor because of heavy precipitation.

The Montreal-based railway says it moved seven trains during the weekend but decided to “proactively close its network'' because rain was causing increased debris, washout and landslide activity.

CN says northbound and eastbound traffic to and from Vancouver are still affected by this situation.

Canadian Pacific Railway Ltd. cars loaded with Prairie grain and fuel entered Vancouver last Wednesday for the first time in days after its rail corridor sustained heavy damage in some 30 locations between Vancouver and Kamloops, B.C.

However, the Calgary-based railway says it needs access to CN tracks on its busiest corridor where they share rail infrastructure in order to maximize capacity.

At the country's busiest port, a high number of cargo ships are anchored and hampered from unloading their loads while empty shipping containers are rushed back to Asia.