Vitezslav, yes I mean red rear lights.
Well, it's very interesting about livery - I thing that ЧМЭ2-250 had experimental factory livery because it's jubilee lok - you can find "Jubilee" under the number of ChME2-250 - another ones have standard livery - these are the pictures.
ЧМЭ2-488
ЧМЭ2-393 , 320, 306
With best regards,
Ivan