After a massive overnight blizzard, conductor Jim and engineer Jordy are hauling $50 million worth of freight from Vancouver-straight into the heart of the avalanche zone. High in the mountains, avalanche technician Derek makes a startling discovery and prepares to detonate a man-made snow slide. The snow-removal crew tackles giant ice columns that could spell disaster for passing trains. And, after the avalanche bombing, it's all hands on deck. Meanwhile in Ontario, off-gridder George fills an entire car with firewood for delivery to an isolated Northern community. It's an exclusive journey through the icy mountain wilderness on the country's most extreme railway. Shutting down is not an option, and it's in the coldest frostbitten months that the network stands up as a feat of modern engineering.