E 499.3 locomotives operate on the 3,000 V DC system and are essentially a DC only version of the ES 499.1.
ČD Class 163.2 and some ZSSK Class 163 locomotives were rebuilt from ČD and ZSSK Class 162. This was caused by lack of fast dual system locomotives as only one Class 362 locomotive was built. This situation solved ČD by switching the bogies between locomotives of ČD Class 363 (same as ŽSR/ZSSK Class 363) and Class 162, ŽSR by switching only the speed-change box and axletrees between Class 363 and Class 162. After that procedure, the locomotives were classified ČD and ŽSR/ZSSK Class 362 and ČD Class 163.2 and ŽSR/ZSSK Class 163.
All 30 locomotives owned by ČD Cargo were rebuilt to class 363.5 (dual voltage) by Škoda. ZSSK announced tender for rebuilding 15 locomotives class 163/162 to class 361, which was won by ŽOS Vrútky. As of January, 2014, 5 locomotives of class 361 (dual voltage, max. speed 140 km/h) and 4 locomotives of class 361.1 (dual voltage, max. speed 160 km/h) were built.
Because of the financial problems of ČSD (and then ČD and ŽSR) after the Velvet revolution, Škoda rebuilt 9 pieces of the fourth series and sold them to FNM, Italy. These were classified as FNM Class E.630. In 2010, all E630 locomotives were sold to Czech private operator RegioJet and were rebuilt to class 162.