Haven't seen it posted elsewhere, but the patch has caused the file size of Dresden to hugely increase, as if it is no longer compressed. TrainSim-Matt - Can you confirm if this is international?
It IS uncompressed. You can compress it yourself, just like before 4.26 with compact using CompactGUI. Will save about 10 gigs.
Just for context, before the update it was around 5GB - it's gained quite a bit of weight! Bit scared to load it now because loading times were really long anyway for me.