Basically during the first train ride, as you pass through the second tunnel this loading screen comes up.
This loads for ~<1 min
Then I get transfered to this screen. Music and sounds still play.
Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.