Alright, let’s talk about this Fallout London crash. I was super hyped to finally jump in, you know? Got everything installed, booted up Fallout 4, started the whole process. Everything seemed smooth sailing at first.

Then came the train part. You get on, things start chugging along, you see that loading screen… and bam! Straight back to my desktop. No error message, nothing. Just gone. Talk about frustrating, right?
My First Attempts
So, first things first, I did the usual stuff:
- Verified the game files for Fallout 4 through Steam. Did that twice, just to be sure.
- Checked the Fallout London mod files themselves. Made sure the download wasn’t corrupted or anything.
- Double-checked the load order. I use a mod manager, so I ran the sorting tool, looked for any obvious conflicts near the London files. Seemed okay.
- Tried disabling a few other mods, especially script-heavy ones or those that alter world spaces, thinking maybe there was a fight happening behind the scenes.
None of that worked. Still crashed right after the train loading screen every single time. I must have tried loading that save like ten times, getting more annoyed each time.
Digging a Bit Deeper
Okay, so the basic stuff wasn’t cutting it. I started thinking maybe it was something deeper, like how the game handles loading big new areas. Fallout 4 can be a bit finicky with large mods, especially ones adding entirely new world spaces like London.
I decided to mess around with the INI files. These configuration files control a lot of the game’s engine settings. Sometimes, tweaking them can help stability, especially with mods.

Here’s what I did:
- I went to my `DocumentsMy GamesFallout4` folder.
- I opened up `*`. If you don’t have one, you can create it. It’s generally safer to put tweaks here so they don’t get overwritten by the game launcher.
- Under the [Archive] section, I made absolutely sure these two lines were present:
bInvalidateOlderFiles=1
sResourceDataDirsFinal=
This helps the game load loose mod files correctly. I already had the first line, but added the second one just in case.
- Then, I looked at the [General] section. I’d read somewhere that sometimes increasing the cell buffer can help with loading large areas or transitions. So, I added these lines (or changed them if they existed):
uExterior Cell Buffer=72
uInterior Cell Buffer=12
The default values are lower. I figured maybe giving the game a bit more breathing room to load the new London cells might prevent the crash during that specific train transition. I wasn’t sure if it would work, but hey, worth a shot.
- I saved the `*` file.
The Moment of Truth
With those changes saved, I booted up Fallout 4 again. Loaded my save game right before getting on the train. Took a deep breath, interacted with the train door, and watched the loading screen.
It worked! The loading screen finished, and there I was, standing in post-apocalyptic London. No crash. Felt like a massive weight off my shoulders, honestly.
So yeah, that was my little adventure getting Fallout London to actually load into London. Messing with those INI settings, specifically the cell buffers under `[General]` and ensuring archive invalidation was properly set up in `*`, seemed to do the trick for me after the train crash issue. Hopefully, if you’re running into the same headache, maybe giving this a try will help you out too. Good luck!
