The ČSD Class S 499.0 and S 499.1 are essentially ČSD Class S 489.0 locomotives with revised gearing for higher speeds and added electrodynamic braking system. They operate from the 25 kV 50 Hz overhead line electrification system in both the Czech Republic and Slovakia. Their design can be traced back to the S699.0 locomotives produced by Škoda in 1962.
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