This story originally appeared on RealTime/STL.
The first phase of the Union Station renovation will be revealed Saturday, but some folks got an early peek inside, and have shared photos and videos on social media.
Among the changes to the 123-year-old building: 3-D mapping in the Grand Hall. Suzi Mahe shot this video Friday during a test run of the 3-D mapping videos.
David Craig also shared photos and videos of the hall Friday.
Sarah Crowder shot a short video of the Grand Hall without the 3-D mapping.
Saturday is National Train Day. Trains will return to Union Station, and activities are planned throughout the day.