There is. In fact it's called a "land port" for a reason, the park has a huge freight yard connected to 2 rail lines it's just not shown in this picture because it's shared infrastructure of the industrial park.
That area is called 郑州港区 (literal translation Zhengzhou "port area", full name: 郑州航空港经济综合实验区) is actually for it's closeness to the airport (ZHCC). English reference: https://en.wikipedia.org/wiki/Zhengzhou_Airport_Economy_Zone .