Reporters from the
Washington Post arrived at the train station in Kramatorsk 15 minutes after the attack.
Are they on duty around the clock in every Ukrainian city?
Not every city, but WP journalists were in the region recently reporting near Kramatorsk:
https://www.washingtonpost.com/world/2022/04/02/eastern-ukraine-frontline-scene/ so if you're implying that they arrived there because they were told about the attack on civilians in advance - that's absurd on a few different levels.