They want to put trunk network lines alongside HS2. That is not a lot different from what C&W did a couple of decades ago in the days of British Rail.
PUtting 4G towers alongside it is also a good idea.
However this won't be the panacea that some people might think.
A good proportion of the route will be in either Tunnel or Cutting. Unless those towers are up high they aint' gonna get many customers.
This is excuding the radio network that they will have to install to get WiFi on the trains in the first place.
Why would you want to pay for data (over 4G) when the trains are supposed to have free WiFi?
Sounds like some really joined up thinking.
SOP for Governments the world over really.