You are correct. In the 1800s, private companies built the railways, eg London and Brighton Railway which opened the mainline in 1841.
As for the infrastructure, when it was privatised, weren't the lines and stations sold off as Railtrack which then went bust and a lot of rich people lost a...
You're a card aren't you. First moaning that they don't invest in infrastructure and now moaning that they haven't for 50 years when in fact they have been for a number of years. Think they re-evaluated the network following the crash at, I think, Hatfield.
What is your solution then. Don't...
Guessing you're not aware of all the upgrading work being done on the London Brighton line, including a full closure for a week in Feb between Three Bridges and Btn!
You can buy tickets on line and get them sent to your phone via the Northern App
https://www.northernrailway.co.uk/travel/free-mobile-app?_ga=2.61169067.685788343.1527078136-1394180682.1522835593
Welcome to the 21st century.