Thank you!

The section between Ulan-Ude and Vladivostok (the most fascinating part of the Trans-Siberian Railway) is missing in the report.

Tickets from Russian points to China (either via Ulan Bator or Harbin) can be booked on pass.rzd.ru, as well - without any surcharge. However, you need to pick up the paper ticket at a ticket counter in Russia.