Building walls in Voidtrain requires completing a specific progression loop rather than simply crafting them from your handheld hammer menu. Wagon walls and enclosed cabins are categorized as exterior decor blueprints, which are obtained by feeding mushrooms to adopted Rofleemo pets. Once a blueprint is unlocked, you must dock at a Depot and use the Building Console to attach the walls to your train platforms.
Understanding this separation between the standard tech tree and cosmetic decor unlocks is essential, especially because structural walls are a strict prerequisite for mounting heavy train armor later in your journey.
The Progression Loop: How to Unlock Wall Blueprints
Unlike workbenches, smelters, and engine upgrades that unlock directly on your Research Table, wagon walls come from the game's creature and exploration systems.
- Obtain Chests from Witch Islands or Arenas: As you travel through the Void, follow swarms of fireflies to locate Witch Islands, or stop at trial beacons to fight insect waves under the Arena Keeper. Completing the island puzzles or surviving arena waves awards reward chests.
- Open Chests at the Depot Altar: Transport your earned chests on your train to the next Depot. Clear out the enemy soldiers stationed there, then carry the chest to the altar or anvil located at the far end of the depot base to break it open. These chests drop high-tier resources, weapon parts, and special mushrooms.
- Adopt and House a Rofleemo: Gather amber chunks or unlock caged Rofleemos found at depots. Build a pet bed or perch on an open train wagon to invite the Rofleemo to join your crew. Keep in mind that train platforms have limits on pet beds, requiring wagon expansions as your crew grows.
- Feed Mushrooms to Your Rofleemo: Interact with your Rofleemo and feed them the mushrooms harvested from depot chests. In return, the Rofleemo will gift you decor blueprints. These gifts randomly unlock exterior train elements, such as standard wagon sides, closed cabins, decorative shelves, and interior lighting.
Once the Rofleemo provides a wall blueprint, the recipe permanently registers in your building catalog, allowing you to install that wall style at future station stops.
How to Build Walls at the Depot Building Console
You cannot place permanent exterior walls while driving through the Void tracks. Even though the handheld hammer allows on-the-fly floorboard repairs and workbench relocation, full structural additions are restricted to station stops.
- Pull into a Depot: Bring your train to a complete stop inside any standard Depot.
- Access the Building Console: Walk over to the train-customization terminal located on the platform alongside your tracks.
- Select Your Target Wagon: Enter the wagon customization overview. Look for the empty square or circular node markers placed along the outer edges of your wagon platforms.
- Choose Your Wall Type: Clicking an edge node brings up your list of unlocked wagon sides and cabins. If you have fed your Rofleemo enough mushrooms, options such as open cabins, luxury closed cabins, or standard wagon walls will appear in the selection list.
- Confirm and Construct: Select the desired wall style. The materials will automatically be pulled from your inventory or your platform's Builder's Boxes.
| Wall Component | Typical Resource Requirements | Installation Location |
|---|---|---|
| Standard Wagon Sides | Iron Bars, Bolts | Edge sockets via Depot Building Console |
| Closed & Luxury Cabins | Iron Bars, Bolts, occasional Leather | Full wagon perimeter via Depot Console |
| Floorboards (Replacements) | 1 Wood (Basic) or Scrap (Armored) | Handheld Hammer (trackside or depot) |
| Train Armor (Secondary Plating) | 1 Steel Bar + 1 Bolts per segment | Top edge sockets of existing wagon walls |
Why Building Walls Is Crucial for Train Defense
While walls enhance the visual appearance of your train and turn a bare flatbed trolley into an enclosed locomotive, they also provide critical survival advantages during combat encounters:
- Gunfire Cover: Enemy soldiers often attack from outpost checkpoints or pull alongside your tracks in chasing trains. Enclosed or half-height walls provide vital line-of-sight protection, allowing you to take cover, reload, and return fire safely.
- Mounting Surface for Train Armor: The research tree contains a technology node for Train Armor. Many players research this upgrade early only to find it cannot be attached to flat platforms. Train armor does not snap onto bare floors; it is a modular cap that specifically mounts along the top rim of pre-existing wagon walls. Without walls built first, train armor cannot be installed.
Troubleshooting Missing Walls and Crafting Issues
If you cannot place walls on your train, check the following common failure points:
- Empty Selection Menu at the Console: If clicking the wagon edge node shows no available items, you have not yet unlocked wall blueprints. Researching high tiers on the Research Table does not grant walls; you must obtain mushrooms and feed them to your Rofleemo.
- Attempting Build Mode with the Hammer: The handheld hammer in building mode only manages interior stations, decor furniture, and floor replacement. It cannot place structural wagon exterior walls while cruising. You must wait until you reach a Depot terminal.
- Missing Refined Materials: Standard walls require processed materials rather than raw scrap. Ensure you have smelted sufficient Iron Bars and crafted Bolts at your workbench before pulling into the station.
