Transport Fever 3 Nvidia Driver 621.01 Crash — How to Fix

Quick answer: Urban Games confirmed on 21 October 2026 that the Nvidia GeForce 621.01 driver makes Transport Fever 3 crash — mainly on RTX 50-series (RTX5XXX) cards. If you haven't installed 621.01 yet, don't. If you already have, roll back to the previous GeForce driver. A fix is already live on the Steam preview branch (build 40425), and a full hotfix for the Stable channel is in testing.

The problem (official)

On 21 October 2026 Urban Games posted a pinned thread on the Steam discussion board (and the same notice on the official forum) confirming the crash in-studio:

"We are monitoring reports of crashes (and have confirmed in the studio) for Nvidia users who have installed the latest GeForce driver (621.01)." "…we currently believe this is related mostly to players using the RTX5XXX series graphics card."

The key facts, all from the developer (OFFICIAL):

Fact	Detail
Driver	Nvidia GeForce 621.01 (the latest driver at the time)
Cards affected	Mainly RTX 50-series (RTX5XXX)
Symptom (official wording)	"crashes" / "stability problems"
First confirmation	21 October 2026 (Steam pinned thread + official forum)

The official support "Known Issues" page does not list this driver conflict yet — the information lives only in the pinned Steam thread, the official forum, and the 22 October stability-update announcement. That gap is why most "TF3 crash fix" pages miss the 621.01 cause entirely.

How to fix it (in the official order)

Urban Games gave a clear order of preference (OFFICIAL):

Haven't updated yet? Don't. The developer's wording: "we recommend that Nvidia players hold off on updating their drivers for the time being."
Already updated and crashing? Roll back. The developer's wording: "reverting to the previous released Nvidia GeForce drivers should restore gameplay without issue." (Official wording is "the previous released driver" — the specific version number 617.42 that players mention is player-reported, not officially named; see the FAQ.)
Want the fix now? Join the Steam preview branch. The fix for this exact conflict is already on the public preview branch as build 40425 (OFFICIAL release note below).
Prefer to wait? A full hotfix for the Stable channel is in testing and will be released once testing is complete (OFFICIAL).

The fix is already on the preview branch

The 22 October 2026 stability update confirms the fix (OFFICIAL):

"Fixed crash introduced with NVIDIA GeForce Driver 621.01 on RTX 50xx GPUs"

That fix shipped on the Steam preview branch as build 40425 (22 October 2026). To get it early:

Steam Library → right-click Transport Fever 3 → Properties
Go to Game Versions & Betas
Select the preview branch from the dropdown
Steam downloads build 40425; switch back to the default branch the same way

If you'd rather not use a preview build, roll back the driver (step 2 above) and wait for the hotfix to reach the Stable channel.

What the crashes look like (player reports)

The official posts only say "crashes" and "stability problems" — they do not describe the exact symptom. Player reports across the Steam thread and community forums fill in the picture (PLAYER_REPORTED, not official):

Crash to desktop, most often when opening a construction/build menu (train, ship, road/rail/water tabs) or a terrain overlay
The game log showing "Device loss detected!" / "Device Lost" with unusual VRAM behaviour

Treat the specific triggers as player-reported — the only officially-confirmed claim is "crashes / stability problems on 621.01, mainly RTX 50-series."

Official timeline

Date	Event	Source
21 Oct 2026	Crash confirmed in-studio; advice to hold off updating / roll back	Steam pinned thread + official forum
22 Oct 2026	Fix for the 621.01 conflict enters the preview branch (build 40425); hotfix in testing	Official stability-update announcement + release note
TBD	Full hotfix released to the Stable channel	"Once testing is complete" (`OFFICIAL`)

FAQ

Is 617.42 the version I should roll back to? 617.42 is the previous GeForce driver version that players mention rolling back to — it is player-reported, not a version the developer named. The official instruction is simply "the previous released Nvidia GeForce drivers." If 617.42 was the driver you had before 621.01, rolling back to it matches the official guidance; just don't treat "617.42" as an official recommendation.

Is this a Vulkan issue? The official posts do not mention Vulkan. Keep any Vulkan talk separate — the confirmed conflict is the 621.01 driver itself.

Why isn't this on the official Known Issues page? As of the last check, the official Known Issues page only has generic "update your drivers / clean reinstall" advice and does not list the 621.01 conflict. The information is in the pinned Steam thread and the forum instead.

Does this affect everyone or just RTX 50 cards? The developer says it is "related mostly to players using the RTX5XXX series." Older cards are not called out, but the developer asked affected players to report their card model while investigating.

Official sources / verification

Data point	Status	Source	Last verified
621.01 causes crashes, confirmed in-studio	Official	Steam pinned thread · Official forum thread	2026-10-23
Mainly RTX 5XXX cards	Official	Steam pinned thread	2026-10-23
Advice: hold off updating / roll back to previous driver	Official	Steam pinned thread + official forum	2026-10-23
Fix for 621.01 conflict on preview build 40425	Official	Second Stability Update · Preview build 40425 thread	2026-10-23
Hotfix in testing, to be released	Official	Second Stability Update	2026-10-23
Crash in construction menu / terrain overlay, "Device Lost"	Player reported	transportfever.net thread · ComputerBase forum	2026-10-23
617.42 as the roll-back target	Player reported (not official)	transportfever.net thread	2026-10-23