A freight crew racing towards Anchorage encounter an icy challenge as they dodge intruders on the track. In the wilderness, homesteaders team up to search for an abandoned cabin washed down stream and trapped in ice.

The freight train battles north to make a crucial delivery, heading to the highest point on the Alaska Railroad; and off-the-grid, things get steamy as old-timers JT and Marvin build a traditional bath.

A magnitude-4.2 earthquake threatens to bring the railroad to a standstill and derail a speeding freight train. Steve and Cassie Brosius race to build an emergency shelter to protect their young baby. Dave Weems’ nieces visit to sample life in Alaska.

A communications shutdown leaves a train hauling the biggest load ever moved on the Alaska Railroad hurtling towards a ‘dead zone’. Off-grid homesteaders tackle the challenge of living off the land in very different ways.

With time running out, the freight crew struggle to make their delivery to a salvage crew stranded in the wilderness and Jim James returns from town with a huge surprise for his wife Nancy.

A devastating snowstorm blocks Alaska’s lifeline. Danny and Animal to bring out the Beast, a 67 ton snowplow - and race to clear the way for a freight train hauling vital diesel to Seward. And homesteaders, Mary and Clyde, need an emergency generator.

After an accident, veteran off-gridder Jim James attempts to reach the hospital by train, but obstacles may put him in jeopardy. Elsewhere, the freight crew fights to open up a port in lockdown.

Freezing temperatures threaten a fresh water supply; J.T. Evans plans to bring a taste of the tropics to Alaska.

A quarter of a billion dollars' worth of military hardware is on board, but a rogue gunman threatens to derail the journey. Off grid, Nancy and Jim face challenges during an ambitious cabin build.

A couple must move their cabin away from a rapidly rising river; a leaky roof must be replaced before a storm; an avalanche threatens to derail a freight train.

A homesteader races to airlift his stranded snow machine out of the frozen tundra; disaster strikes when a couple spends their first winter alone in the wilderness.

As spring arrives, people scramble to repair their cabins and homesteads; the freight team prepares for a cargo of explosives.

A family faces down a threat to its food supply; a man makes a grueling 5-hour hike in the wilderness; an ice storm threatens to derail a scheduled freight train.

The spring thaw puts the railroad into meltdown mode; and a freight train is stalled on the infamously high Hurricane Gulch.