Николаевская железная дорога
In 1974 and 1979 Škoda produced 12 Škoda 66Е locomotives capable of a speed of for the Soviet Union. These were designated as Chs200 (ЧС200) and were used mainly on the Nevsky Express train on the Moscow – Saint Petersburg Railway. The locomotives were refurbished in the 1990s and during testing in 2007 one locomotive reached a speed of .