Caption: CN B 78131 07, rolls westwards down the Halton Sub with CN 3034 on the point and CN 2968 as the mid train DP unit. This 209 car unit train of Potash empties is bound for Yarbo, Saskatchewan and originated in Moncton, New Brunswick as B 73111 06. Originally planned to operate over the more direct route through Northern Ontario, the symbol was changed to 781 at Belleville to allow it to detour south of the Great Lakes due to congestion in Northern Ontario.