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FEVER 3FIELD GUIDE
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PC & SAVES / PREVIEW UPDATES

How do you install the Steam preview update?

Checked October 1, 2026 (PDT). Official notes list 40415 as Steam preview and 40408 Steam / 40393 Epic & GOG as stable. Recheck the notes before testing a later build.

Close TF3 and choose preview in Steam's branch settings

Steam Library → right-click Transport Fever 3 → Properties → Game Versions & Betas → preview. Let Steam finish updating, then check the build in the main menu's bottom-right corner. Preserve your stable save: a save written by a newer preview may not load after reverting.

A red cargo tram beside freight loading platforms and industry buildings in Transport Fever 3
A freight loading scene. It does not demonstrate warehouse placement or transfer success; use the storage checks below. Official press image · © Urban Games ↗

Install and verify

  1. Keep a stable-save backup. Follow the save-file guide before testing. Do not overwrite your only stable copy.
  2. Close the game and select preview. Use the Steam path above. These English client labels follow the official manual; localized Steam wording may differ.
  3. Wait for the download, then launch. Compare the main-menu build number with the current official notes. The preview can be equal to or newer than stable.
  4. Save under a new name. Test the affected view and mods without replacing the stable save. Preview stability and mod compatibility are not guaranteed.
WATCH THIS SYSTEM

Industries & Cargo

Origins, cargo categories, loading infrastructure and transfers.

Watch on YouTube ↗

Official pre-release overview. Use the written checks for this task; older videos may describe plans that later changed.

What does 40415 address?

The October 1 preview notes list rendering improvements for camera movement and active layers, video-memory improvements and a low-VRAM budget fix. They also list several crash fixes, including UI updates and catchment rendering. This does not establish a universal stutter fix or prove that every campaign save crash is repaired. Use the same-save performance comparison and Cities-layer test.

How to tell it worked

Steam finishes the update and the main-menu build matches the intended preview. Separately compare the original symptom in the same save and view; installing successfully is not proof of improved performance.

Return to stable or resolve a mismatch

  • To revert: close TF3, return to the same Steam branch selector and choose the default/main release rather than preview. Wait for Steam and verify its build again. Load the preserved stable save if a preview-written save is incompatible.
  • Preview is absent or the build is unchanged: confirm you are viewing TF3's Steam Properties, that the branch selection persisted and that its download completed. Compare the latest notes; preview and stable may eventually share a build.
  • Epic or GOG: the manual documents this preview selector only for Steam. Use your client's normal stable updates; this page does not supply an unverified preview download for another store.