Building the Steam Engine in Voidtrain replaces your starter manual trolley with a motorized locomotive capable of higher speeds, afterburner acceleration, and increased platform capacity. You must research the technology, expand your locomotive platform, clear specific starter components, and install the module at a depot building console.
Research Requirements and Crafting Recipe
Before placing the locomotive at a depot, you must unlock the Steam Engine technology at your train's research table. The research step costs research points and crafting components. In player gameplay footage, unlocking the technology required items such as copper pipes, bolts, and gears, or around 40 research points depending on story and tech tree progression.
Unlocking the Steam Engine also opens up subsequent tier technologies, including the Smelter II, brass casting, and zinc extraction.
To build the actual Steam Engine module at the depot console, prepare the following crafting ingredients:
| Required Material | Base Quantity | Notes |
|---|---|---|
| Iron Bars / Ingots | 4 to 10 (up to 16–22 across full assembly) | Needed for base module and mechanical parts |
| Copper Pipes | 4 | Crafted from copper at workbenches |
| Bolts | 4 | Crafted using metal/screws |
| Gears / Cogs | 4 | Requires iron components |
| Pistons / Forcers | 2 to 4 | Crafted using metal and fat/grease |
(Note: Material counts observed across community gameplay vary slightly depending on game patch updates, whether you craft sub-components from raw ore, or if you use recycled mechanical junk/waste).
Platform Expansion Prerequisites
You cannot install the Steam Engine on a stock single-length trolley. The engine requires significant physical space on your train's lead car.
- Locomotive Platform Length: The first wagon (the locomotive car) must be expanded. The Voidtrain Wiki lists a minimum requirement of 3 platforms long, while in-game tutorials and Steam community guides recommend expanding the car to 4 platforms. Expanding to 4 platforms ensures sufficient room for the engine body and gives you remaining deck space for storage crates or an open cabin.
- Floor Requirement: You must lay down wooden flooring across the expanded platform segments before attempting to place the engine structure.
- Wagon Capacity Increase: Installing the Steam Engine increases your train's maximum platform capacity (the Voidtrain Wiki notes base platform capacity increases from 6 to 8 platforms, while certain in-game tooltips display up to +8 capacity additions).
Upgrading the wagon length at the depot console typically requires components like springs, bolts, bearings, and iron ingots per extension segment.
Step-by-Step Installation at the Depot
The Steam Engine can only be assembled while docked at a depot using the building console or construction hammer mode. Follow these steps to prevent common placement errors:
- Clear All Objects from the Front Sections: Clear out workstations, research tables, storage boxes, gardens, and Rofleemo nests from the front segments of the first car. Use the hammer's relocation or disassemble function to move crafting stations toward the back of the train.
- Demolish the "Old Engine": The game interface requires you to "demolish the old engine." According to developer responses on the Steam forums, the starting Trolley Handle counts as the manual engine. You must disassemble the trolley handle to satisfy this objective.
- Remove Conflicting Levers and Fixtures: Community troubleshooting shows that the starting horn, brake lever, and transmission handle often block the placement boundary of the new engine. Disassemble or relocate these parts. (Placing standard brakes and transmission handles elsewhere on the train remains free of resource cost).
- Open the Depot Build Console: Select Build a Module on the locomotive car.
- Align and Place the Steam Engine: Use your movement keys to pan the overhead camera. Position the green outline over the cleared platform space and left-click to construct the engine.
Operating and Fueling the Steam Engine
Once installed, the Steam Engine consolidates your main movement controls into the locomotive cab, though extra manual brakes can still be placed along the cars:
- Engine Controls Interface: Inspecting the engine opens the control hatch where you monitor water levels and fuel.
- Fuel Requirements: The engine runs on Steam Batteries, crafted at the workbench using water and coal chunks (recycled or processed from lumps of coal).
- Speed Settings: The locomotive interface features settings for Stop, Slow, Medium, and Fast. Players note that running the train on the lowest setting ("Slow") can operate without consuming fuel, while higher speeds drain steam batteries.
- Afterburner: The handle on the engine allows you to engage the afterburner for maximum acceleration, ideal for escaping threats or speeding between stations.
Frequently Asked Questions
Why does the game say "Demolish the old engine"?
The starting manual trolley handle is classified by the game engine as your old engine. Open your construction hammer or depot interface and dismantle the trolley handle directly.
Why won't the Steam Engine turn green for placement?
Placement failures usually occur because:
- The first train car is shorter than the required 3 to 4 platform segments.
- Wooden flooring has not been laid down over the chassis.
- Objects, crafting benches, or starting control levers (horn, brake, transmission) are occupying the placement grid.
Can you still collect resources in the Void while driving the Steam Engine?
Yes, but traveling at higher speeds makes gathering floating scrap, wood, and coal by hand or grappling hook significantly harder. Players generally recommend maintaining slow speeds while looting Void pathways and saving high speeds or the afterburner for combat chases and minefields.
