Now classified as Class 363, these locomotives passed to České dráhy, rail operator in the Czech Republic, and to ZSSK, rail operator in Slovakia.

In 1980 Škoda produced ES 499.1001 and 1002 as prototype locomotives for the replacement of the existing ČSD fleet.

Two single system derivatives were also created S 499.2 (AC) and E 499.3 (DC).

During 1990 further development to run at 140 km/h lead to the ČD Class 362, but an order for 30 locos was canceled due to financial problems.

363s are currently used to haul these services As of June 23, 2008, 12 363s remained in service with ZSSK,[3] 23 with ZSSK Cargo,[4] 63 with ČD[5] and 47 with ČD Cargo.