Via [url=https://steamcommunity.com/games/CSGO/announcements/detail/520828168477606336]the Steam Community[/url]:

[quote=Valve][b][u]MAPS[/u][/b]
[b]Train[/b]
- Fixed various minor visual bugs and gaps in world
- Added dirt and wetness onto crates and tarps where appropriate
- Widened opening on A site between Hell and Tunnels
- Opened container door on back of the train near Ivy/Tunnels

[b][u]MISC[/u][/b]
- Fixed a case where ragdolls could get created with extreme initial velocities
- Added markup for individual matches in Steam Game Recording timeline
- Fixed a regression where deploying weapons weren't allowing immediate inspecting
- Fixed fingers crossing into butterfly knife geometry during inspect animation
- Fixed weekly care package preview of weapon cases not having a close button
- When moving away from annotation nodes, required grenade is no longer removed[/quote]

Rumor has it:

- Size is close to 425 MB (with Workshop Tools installed)