I cannot reproduce this after the update today (I didn't try before). This sounds like the locale issue that was fixed, please reopen if you can still reproduce it.
I am still experiencing this issue. The train stops in a pit and the game just stops. I can still look around, run around, and jump around inside the train car, but that's about it. Happens every time i launch the game. I originally was able to play the game (almost finished) but my game save had disappeared after doing an update, since then i have been unable to play.
I am playing the game on English language.
ArchLinux x64
Kernel: 3.7.5-1-ARCH
AMD Radeon HD6970 (catalyst drivers)
Intel i5-2500k
Mate-Desktop
After the update (see Alfred's comment) the problem was solved.
My advice: be sure that you are using the latest steam deb package (my bootstraplinux_ubuntu12_32.tar.xz was outdated and i'm not running Steam on ubuntu too)
Nothing extracted yet.
During the initial "intro" (aka the trip on the train) the game stucks:
the train stops on to a pit and stays there forever.
This problem occurs only if HL1 language is set to Italian (No issues with English).
Steps to reproduce: