This is caused by what is largely referred to as the "elevator stuck bug" and has appeared in all Half-Life games from day one. Here's some possible fixes:
1. An easy fix and detailled description is provided in the "Poke646" walkthrough, browse to "Map 3" in the 4th chapter. This fix worked for most people.
2. If this doesn't work, try launching Poke646 with the console (add "-dev -console" to the command line of your Poke646 desktop shortcut), play to the mapchange after the trainride and open the console by hitting the "^" key. Type in "noclip" and use your movement keys to fly out of the situation. Type in "noclip" into the console again to stop the fly mode.
3. If even this doesn't work, you should try to load a savegame from after the trainride. For this case I provide a bugfix patch (50 kb) which includes savegames in all skill settings, starting in the new map with medium health and ammo. Please refer to the included readme file for detailled instructions on the usage of the files.


