Why is the express train from Xi to An? February 2022 16 is particularly slow?

The reason why Xi 'an Express 16 was particularly slow in February 2022:

1, freight drivers need to be checked for freight codes when entering, and it is easy to be congested when passing through high-speed intersections, and the delivery speed of many courier companies is affected by the epidemic.

2. When the epidemic situation is released, the express delivery needs to be disinfected many times, and the delay time on the way is also long.