Cross the tajik border with uzbek Som - limited amount?

Hi everybody,
will it be a problem to cross the border tot Tajikistan with uzbek Som? Is the amount of uzbek money you can carry with you limited? I will arrive in Tashkent 16th of october and from there go to Termez and try from there to cross the border by train. As I have seen on a map there are two railways from Termez to Tajikistan - one going to Dushanbe and the other going to Qurghonteppa, which is the one I want to go with.
Thanks a lot for your answers!

It only depends on how much you gonna carry with you. Anyway if its not more than USD 100, youll have any problems. But don`t forget to fill in the declaration and declare all your money.