ČSD Class ES 499.1 is a class of electric locomotives used primarily for passenger trains in Czech Republic and Slovakia. Now classified as Class 363, these locomotives passed to České dráhy, rail operator in the Czech Republic, and to ZSSK, rail operator in Slovakia. Class 363 is also used by ČD Cargo and for hauling freight trains. ES 499.1 locomotives operate both on the 3,000 V DC system and the 25 kV 50 Hz AC system.