Foundry 4.0 "Rails & Reactors" is out now!
FOUNDRY Patch Notes — April 28, 2026
Aggregated from Steam, cross-tracked with Battle.net coverage on GamePatchNote.
Hello everyone!
The long-awaited Foundry 4.0 update "Rails & Reactors" is finally here! Before we go into details check out a short trailer we prepared for you!
The 4.0 update brings a few key, frequently-requested features to Foundry.
Key features:
Trains: Unlimited long distance transportation possibilities with a flexible train system.
Xeno Power Plant: Generate high amounts of power with a power plant made out of multiple large buildings.
Info Overlay: We added a toggle-able info overlay that makes it easier to check if everything is working properly in your factory.
Construction Drone: A remote-controllable construction drone that adds convenience when building your factories.
New Assembly Line Robots: More robots to produce and to sell on the galactic market.
New Neon Decor Buildings: New glowing decor opportunities.
Modular Casting Machine: A large modular building to be used in conjunction with the blast furnaces.
The changelog:
Besides the above key features, the 4.0 update also comes with a lot of changes and quality-of-life improvements. Check out the full changelog below:
Gameplay Changes:
Drone miner output is now a fixed rate per minute.
Drone miners are now connected to the entire ore patch instead of just the voxels in range.
Xeno and Technum ore patches now spawn closer to the player’s start location.
Increased character crafting speed.
Reduced research time and requirements for science pack 1 and 2.
Station upgrades sped up for tier 1.
Changed shipping pads so that they cannot move the same item type in both directions simultaneously (you have the option to disable this when you load an old save or when you start a new game).
Reduced cargo capacity of cargo shuttles, but increased speed.
Cargo shuttles now need to accelerate before reaching top speed.
Loaders no longer require power or foundations.
Reduced power demand for xeno crystal/scrap miners by roughly 50%.
Increased high voltage cable range to 24 for every building that had a lower range.
UX Improvements
Polishing pass on power generation building tooltips and screen panels.
You can now open screen panels from any side of the building by pressing ‘E’.
Inventory ui frame now has a helper panel to show all available hotkeys.
Added pipe/power indicator icons to base of fracking tower.
Improved crafting recipe tooltips.
Fixed tooltips sometimes being too transparent.
Improved research frame search functionality to also scan for names of unlocked crafting recipes.
Improved many of the building’s tooltips and polished tooltip frame.
Graphical Improvements
Improved texture filtering on all buildings.
Improved SSAO.
Added ground cloud shadows.
Lighting and fog tuning.
Improved placement effects.
Improved digging effects.
Tuned clouds.
Adjusted workstation LOD distances.
Adjusted screen panel LOD distances to prevent z fighting.
Audio Improvements
Improved many of the machine sounds.
Many of the machine sounds are now limited to prevent cacophony.
Improved drilling sounds.
Improved harvesting sounds.
Improved placement sounds.
New Ambiences.
Optimizations
Optimized foundation tile energy system simulation.
Optimized map rendering.
Reduced dedicated server memory usage.
Optimized audio processing.
Part 1/3 of save file optimization for worlds that have many chunks explored (Part 2 and 3 will be in a future update).
Optimized shipping pad container rendering.
Optimized large solar panel rendering.
Bug Fixes
InfoDB pages now display the correct keybinds.
Fixed an issue that was causing the game to no longer popup an error message when the player’s system is unable to play the game either due to their video card being unsupported or their system missing the correct C++ runtime.
Fixed an error that could occur when using an invalid hex code in the color tool frame.
Fixed an error that could occur when deleting a save file from in game that the player had deleted using windows explorer.
Fixed issue with getting on ladders on some modular buildings.
Fixed incorrect mesh on modular building walkways.
Fixed getting stuck on collision on assembly line producer buildings.
Fixed placement effect not being played correctly on certain buildings.
Fixed an error that could occur when trying to load a very large save file.
Fix bug with xeno tower coverage being incorrect on map.
Fixed issue with stats displayed on ore vein miner.
Fixed issue where workstations weren’t taken into account on finance overview for throughput statistics.
Fixed research queue not showing the proper information when researching infinite researches.
Fixed incinerator screen panel showing wrong time per item when boosted by workstations.
Fixed issue where walkways were preventing proper deconstruction raycasts.
Fixed bug where personal mining drones would not despawn when a character logged off in multiplayer.
Fixed issue with freight elevators not working properly when colliding with certain types of buildings.
Fixed issue with freight elevator upgrading when freight elevators are too full of items.
Fixed error that could occur when using certain symbols in save file names.
Fixed sun/moon rendering when far from origin.
Fixed 3rd person rendering of mining laser in multiplayer.
Fixed desync that could occur when using pumpjacks and workstations.
Fixed desync that could occur when deconstructing modular buildings.
Fixed error that could occur when placing conveyors/pipes.
Modding
The crafting/item yaml files are now shipped with the game in the SteamingAssets/Templates folder.
Thank you for your support!
As always, we want to thank you all for playing Foundry! We still have exciting updates ahead of us, so please keep sharing your feedback on our official channels! Ideally here or in our Discord!
We hope you'll enjoy Foundry 4.0! Here's one more video to wrap things up!