Since the Jan. 14th update for BF4 on the Ps3 can't load Golmud Railway map in Multiplayer option.

Could you please provide us the information which model of the PS3 you own?

You should try to re-install the game:

1. Delete the BF4 game data (not the savegame data)
2. After that, you can run a PS3 file system scan
3. Clean the BF4 disc
4. Install BF4 and update the game with the latest patches.

Cheers
Basti