Train Interiors

Train Interiors

Turn a persistent Main Train into a complete mobile factory. Explore Nauvis, recover abandoned rolling stock, connect new rooms, transfer items and fluids, store energy, expand your train through research, and build an entire factory inside it.

Train Interiors is a standalone version of the Train Interiors system originally developed for The Cave. It is designed for normal Factorio gameplay and does not require The Cave.

Created by BEHROOZZX

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Main Features

• A persistent Main Train that contains real, buildable interior rooms.
• One interior room for every connected locomotive or wagon.
• Automatic Starter Train for every force.
• Exploration-only locomotives and wagons.
• Cargo, fluid, power and Garden transfer systems.
• A shared Train Battery that can power an exterior factory.
• A shared Train Shield with researchable health and self-repair.
• Six Train Interior Expansion levels.
• Seven Main Train capacity upgrades.
• Three Locomotive Garden expansion levels.
• Full Base Factorio 2.0 support.
• Optional Space Age support.
• Multiplayer and force-aware progression.
• Custom Train Interiors main-menu background and thumbnail.
• No custom music.

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Starter Train

When the first player of a force starts a new game, a safe Starter Train is automatically placed nearby.

The Starter Train contains:

• 1 Main Train Locomotive
• 1 Main Train Cargo Wagon
• 1 Main Train Fluid Wagon
• A connected rail section
• 50 Solid Fuel inside the locomotive
• A fully charged 5,000 / 5,000 HP shared Train Shield

The mod searches for safe empty land before placing the Starter Train. It does not delete water, cliffs, resources, enemies, player buildings or factory entities to make room for it.

The initial Main Train capacity is exactly three parts, which is already used by the Starter Train. Research Main Train Expansion 1 before connecting a fourth part.

A new game is recommended so the Starter Train can be created automatically.

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Entering and Leaving the Train

Entering

1. Stand within 10 tiles of a connected locomotive or wagon.
2. Press Ctrl + Enter.
3. Press Ctrl + Enter again within five seconds to confirm.
4. You will be teleported to the reserved 4×4 landing pad inside that exact train part.

A screen prompt appears when you are close enough to enter.

You may also use the Enter Train Interior shortcut from the Factorio shortcut bar.

Leaving

While inside the train:

1. Press Ctrl + Enter.
2. Press Ctrl + Enter again within five seconds to confirm.
3. You will be placed safely beside the corresponding exterior locomotive or wagon.

You can leave from anywhere inside the connected train interior.

Normal Train Driving

The normal Factorio Enter key is not replaced.

• Press normal Enter on a locomotive to drive it.
• Press Ctrl + Enter to enter its interior.

Train Interiors does not take control of standard Factorio train driving or server permissions.

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Persistent Connected Interiors

Every claimed and connected Main Train part receives its own persistent interior room.

Connected train parts share one continuous interior surface, with corridors connecting the rooms in the same order as the exterior train.

Your machines, belts, pipes, poles, storage and factory layouts remain inside the train while it moves.

Every room begins at 40×40 tiles and contains:

• A centered 36×36 green working area
• A protected 4×4 entry landing pad
• Black expansion flooring
• Ten-tile blue utility lanes along the top and bottom
• A corridor connecting it to the next train part

The 4×4 entry pad must remain empty so players always have a safe place to enter.

Utility Lanes

The blue utility lanes are reserved for factory connections between rooms.

They allow:

• Pipes
• Underground pipes
• Pumps
• Storage tanks
• Small, medium and large electric poles
• Substations
• Compatible modded electric poles

Machines and unrelated entities cannot be placed on these lanes and are automatically refunded.

Offshore Pumps cannot be placed on utility lanes. Place them directly beside the water inside a locomotive or the Locomotive Garden.

Power is not transferred automatically between wagon rooms. Use visible electric poles and the utility lanes to connect your interior networks.

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Locomotive Interior

Every locomotive receives a factory room and a 12×4 water pond with a centered 6×4 dry island.

The persistent Main Locomotive also contains:

• The Main Train Battery Substation
• A Train Battery information panel
• A portal to the Locomotive Garden
• The internal connection to the exterior Train Battery power range

Only the persistent Main Locomotive receives these fixed power and Garden systems.

Additional locomotives still receive their own interior rooms and water areas, but they do not receive duplicate Battery Substations, information panels or Garden portals.

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Cargo Wagon Interior

Every Main Train Cargo Wagon has:

• An 80-slot exterior cargo inventory
• One protected 6×6 Import Storehouse
• One protected 6×6 Export Storehouse
• 1,000 inventory slots in each Storehouse

Cargo Direction

• Right Storehouse — Import: Items loaded into the exterior cargo wagon are transferred into this Storehouse.
• Left Storehouse — Export: Items placed in this Storehouse are transferred into the exterior cargo wagon.

Imported items do not automatically loop back into the Export Storehouse. You decide what leaves the train by using belts, inserters, filters and your own internal factory design.

Item transfers preserve stack information and safely retry when a destination is full.

The protected Storehouses are fixed Train Interiors infrastructure. They cannot be mined, destroyed, blueprinted or deconstructed.

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