K4 from Moscow via Ulaanbaatar. A CRH380A came with this HXD3C, I wondered what it would be, only to find a bunch of non air-conditioned coaches... Got it! It's K4!
<a href="//commons.wikimedia.org/wiki/User:N509FZ" title="User:N509FZ">N509FZ</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>