El Bunto - no not international. The compensation rules are very different for "domestic" trains and are not as strictly supported by other agencies (the CAA being quite tight on EU261) When compared to internal flights these do not differ in the sense that you get the same whether it's domestic or international with just the amount of compensation varying by km flown.
My own personal morals would not force me to claim compensation some 5 or 6 years after a flight. Simple as that.