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 DE22000 are usually used for freight transport but are also used frequently for passenger transport. The locomotives main characteristic were that they were the first locomotive in Turkey to have multiple unit (MU) capabilities. This allowed 2 or more to be coupled and used for head-end power, however not all locomotives have this capability.