The EuroSprinter family of electric locomotives is a modular concept of locomotives for the European market built by Siemens. The internal Siemens product name is ES 64, with ES for EuroSprinter and the number 64 indicating the 6,400 kW power at rail.

Based on the Eurosprinter concept the ES 64 U was developed as a universal electric locomotive with a top speed of 240 km/h (149 mph). The series ES 64 U is only capable of operating on the 15 kV 16.7 Hz AC supply. It is in service in Austria with oBB as Class 1016.

ES64U4 is the third generation of the series, based on ES64U2, and ES64F4 offers multi voltage support (25kV 50hz AC, 15kv 16,7hz AC, 3kV, and 1,5kV DC, which means it can be used on every normal gauge electrified routes in Europe

Source: Wikipedia