Sleeping car seats numeration:

Bottom seats - odd numbers, Upper seats - even numbers
Euro-numeration
Сarriage with numbered reserved seats numeration:

Bottom seats - odd numbers, Upper seats - even numbers

Soft-seated carriage numeration:

Bottom seats - odd numbers Euro-numeration
Soft-seated carriage numeration
international traffic (3 seats):
1st class cars without middle seats (13,14,23...)

Bottom seats - red color, Upper seats - yellow color, Middle - blue color