FrostrailBeginner Guide
Inside the Eden Engine locomotive cab in Frostrail

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Operate your mobile base

Frostrail Train Guide – Build, Power and Defend the Eden Engine

The Eden Engine is your transport, shelter, workshop, storage, and main source of heat. Learn how fuel, power, carriages, upgrades, and defenses work together—and why losing the train can end the crew's journey.

Updated October 8, 2026 · Six train systems

Operating the Eden Engine from the cabCore locomotive

Eden Engine

The Eden Engine is the crew's mobile fortress and the heart of the run. It must be fueled, powered, driven, maintained, and defended.

  • Provides travel, heat, power, crafting space, and storage
  • Engine upgrades affect speed and pulling weight
  • Its destruction is a developer-stated game-over condition; exact stats have not been published
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Expanded carriage interior with workbenches and tanksReinforcement

Upgrades

The train can be reinforced and customized with walls, hatches, doors, weapon stations, crafting facilities, and engine improvements.

  • Engine upgrades affect speed and pulling weight
  • More carriages require more power
  • Seven community Beta research names and sample costs; exact effects unverified
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Wooden freight cars moving through the tundraExpansion

Carriages

Additional carriages expand the mobile base and create room for crafting stations, storage, protection, and crew functions.

  • More carriages increase the Eden Engine's pulling-weight and power demands
  • Walls use grid-snapped construction
  • Named carriage types, capacity, and exact limits have not been published
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Fuel canisters in the cab hotbarBranches, logs & charcoal

Fuel

Fuel keeps the Eden Engine moving and warm. Branches, logs, and charcoal have been named by the developer as fuel sources.

  • Fuel and power are connected but distinct operating concerns
  • Fuel consumption and burn times: Not published
  • Resource processing ratios: Not published
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POWER and HEAT machinery inside the trainOnboard systems

Power

The Eden Engine generates the power needed by the train and its facilities while also serving as the crew's major heat source.

  • Power management is a known train responsibility
  • Consumers, grid limits, and generation values: Not published
  • Loss-of-power consequences beyond broad survival pressure: Not published
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Crew firing from a damaged carriage at a track-side threatRevenant attacks

Train defense

Train-defense encounters are being integrated with obstacle-clearing gameplay. Developers have also discussed Revenant waves and mounted weapons such as machine guns or cannons.

  • Train defense was listed in the May 2026 development update
  • Mounted weapons are a developer-described plan, not final balance data
  • Encounter schedules and damage values: Not published
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