CN's train #114 derailed near Spy Hill, Saskatchewan at about 07:00 on December 5. The train had a number of propane cars and cars carrying plastic pellets. One or more of the propane cars caught fire and burned for several days. They have since built temporary track around the derailment and are routing trains through there as of December 10. However, some mainline trains continue to use the north line to clear the backlog.
Spy Hill is on the CN mainline, the Rivers subdivision.
After the derailment, CN detoured quite a few trains over CN's "Prairie North Line", meaning the Gladstone, Togo, Margo, Warman, and Yorkton Subdivisions.
VIA's Canadian was turned at Winnipeg and at Edmonton. Passengers were bussed or flown between these two points. The Canadian resumed its normal route on December 10.