As the winter ice starts to thaw, rockslides wreak havoc on the CPR. Hauling three-kilometers of potash over the mountains to Vancouver, Jordy and Justin must pass through the treacherous rockslide zone-twice. High above the Rockies, roadmaster Nick is on emergency patrol. A falling boulder triggers a rockslide alarm. Following disciplinary action, Jimmy gears up for his first day on the steel gang. And, a team of mechanics repairs the massive ventilation fans inside the legendary Connaught Tunnel. Meanwhile in Ontario, the Polar Bear Express picks up a father and son as they head deeper into the bush on a hunting expedition. It's an exclusive journey through the icy mountain wilderness on the country's most extreme railway.
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