A snowstorm and faulty equipment threatens the freight crew's journey as they race to deliver a heavy load. In the woods Jim and Nancy meet an off grid couple.
Heading to the highest point on the railroad a train battles north to make a crucial delivery. Off grid things get steamy as JT and Marvin build a traditional bath.
A quarter of a billion dollars' worth of military hardware is on board the Alaskan railway, but a rogue gunman threatens to derail the journey.
After an accident, veteran off-gridder Jim James attempts to reach the hospital by train, but obstacles may put him in jeopardy.
In the wilderness, homesteaders team up to track down an abandoned cabin washed down stream and trapped in ice. Plus, a freight crew dodges intruders.
Tempers flare as a train runs into brake problems and a derailment leaves maintenance teams stranded. Off grid, homesteaders avert a fire but are left without heat.
A communications shutdown leaves a train, hauling the biggest load ever moved on the Alaska Railroad, hurtling towards a 'dead zone'.
In Alaska, the spring thaw puts the railroad into meltdown mode and a freight train is stalled on the line's highest bridge by the infamous Hurricane Gulch.