communications infrastructure

"HSR" can stand for many things. Could you please spell out the full term that your "HSR" abbreviates?

"Basic communications infrastructure network" refers to the cables and support systems that carry information. They usually consist of fiber optics and copper cables that run info to and from central switching offices where the information is regenerated and directed to the correct place. It can also include thinks like cell towers if there is a wireless component to the system.

HSR refers to high speed rail.
"Basic communications infrastructure" is here intended to mean the infrastructure for railways, HSR system included. Is it correct to say so?
I found a definition for the plural form of "communication", that is to say, communications may refer to railways, travel, etc.
We Chinese learners of English sometimes are confused as to which word to use to denote to, say, a ministry or department, which is responsible for building the infrastructure of railways, highways, etc.

This is one of the senses of "communications" as a plural noun.