AF-A-2071 was the debut train from Guangzhou to Hong Kong on 23 September 2018, and the debut from Hong Kong to Beijing on the same day, so these markings are dedicated to this occasion.
<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>