3rd Class or Steerage if you ask me. (wasn't is 2nd class that got abolished in the early days of BR?)
Normal mobile coverage on trains is more of a problem than the article makes out.
1) Still lots of NOT SPOTS even within 40 miles of The house of fools (Westminster)
2) What about those NOT SPOTS called tunnels?
Coming into Kings Cross you travel through Gaswork Tunnel. Just when lots of cattle (sorry passengers) want to make calls they can't. The same applies in many cities. Brum (New St), Edinburgh, Glasgow (Queen St) etc etc.
A mega Aerial won't solve that little problem not will it?