Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The ChS4 (Czech: ČS4, Russian: ЧС4) is an electric mainline AC passenger locomotive used in Russia, Belarus, and Ukraine.
ChS4T modification
To overcome some ChS4 shortcomings, in 1971 a modernized version of locomotive was released. It is known as ChS4T in USSR and as 62E in Czechoslovakia.