Aug 20 (Reuters) - Dallas Federal Reserve President Robert Kaplan said on Friday he could see the U.S. central bank eventually issuing its own digital currency, calling it the "last mile" in a digitalization of the payment system that is already in train. "I would imagine in the years ahead -- it"s something the Fed is actively working on now -- and I can see reasons why that will eventually get developed; China is already doing their own experiment with it," he said in a virtual appearance at Texas Tech. Still, he added, the Fed is a "long way" from making a decision and is currently studying the issues, including the potential impact on banks.