Trains and the Perpetual Ember Core

Trains and the Perpetual Ember Core

Trains are more than transport in the frozen world. They move people, food, medicine, weapons, machinery, embers, and the Soft Materials and Hard Materials needed to keep settlements alive. A train can be a home, workshop, fortress, trading post, or mobile lifeline.

Train designs differ by faction, wealth, purpose, and the routes they travel. The systems described here are common principles rather than a claim that every train carries the same equipment.

The Perpetual Ember Core

The locomotive houses a Perpetual Ember Core, the train’s primary energy source. The core provides the baseline power that allows a train and its attached wagons to function. It is powerful, but it does not make a train self-sufficient: output, storage, distribution, equipment capacity, and maintenance still impose limits.

Its standard functions are:

• Propulsion: supplies the energy required to move the train.
• Basic power: provides electricity or usable power to connected wagons and onboard systems.
• Heating: supplies baseline heat to the train, with distribution and demand limiting how warm every space can remain.
• Snow-to-water processing: a forward intake gathers snow as the train moves and processes it into usable water, within the system’s capacity.
• Basic communications: provides ordinary radio communication.

The Core does not create food, spare parts, medicines, or Hard Materials. Water production is also constrained by intake, processing capacity, energy demand, and maintenance.

Locomotive upgrades

The locomotive can be improved without adding a dedicated wagon for every function. Potential upgrades include:

• Improved power distribution: moves power more efficiently between connected systems and wagons.
• Increased capacity: supports greater demand from a larger or more equipment-heavy train.
• Improved snow-to-water output: processes more snow into usable water.
• Advanced communications support: improves the locomotive’s basic radio capability; a dedicated Advanced Communications Wagon can extend it further.
• Snow clearing: adds or improves equipment at the front of the locomotive to clear snow from the track. Snow clearing is a locomotive upgrade, not a separate wagon.

These upgrades are established design options. Their research costs, progression tiers, and precise unlock conditions remain undecided. For the distinction between stored resources and locomotive-provided systems, see Resources and Survival Systems.

The train as a lifeline

A train’s resilience depends on more than its Core. It needs people with the right skills, food and water, working equipment, spare parts, and access to a functioning railway. Damage to a key wagon or a broken supply route can create a crisis even when the locomotive still runs.

Most settlements rely on trains for at least some essentials. Remote communities with geothermal heat or other natural warmth can reduce their dependence on embers, but usually still need rail access for medicine, tools, machinery, and specialist goods.

Wagon principles

The wagon catalogue is divided into three groups:

1. Core modules that form a well-equipped privately funded train’s basic roster.
2. General unlockable wagons that extend a train’s capabilities.
3. Faction-associated wagon types that reflect particular traditions or military, religious, or industrial needs.

These are design categories, not universal requirements. A small community train, military convoy, or freight consist may omit, combine, or replace modules to suit its purpose. See Train Wagons for the catalogue.