So, because AGA trains (not entirely AGA's fault) are behind the times, I should spend money in excess of my season ticket to buy a portable charger? Or change my network?
I carry a portable charger for my own convenience, and I think you're getting a little desperate if you are now arguing you shouldn't have to get one for when a train is delayed.
I have mine so I can charge my phone when the battery runs low, wherever that might be. It's for my own convenience and peace of mind. If it's on a delayed train, so be it. If it's on a plane so I can watch another film, all the better. If I've been heavily using a game or whatever, it's all good.
My comment about networks was merely pointing out that some offer better data service in those areas. If you're on EE, you should enjoy a pretty good service with 4G for some of it - which on EE is blisteringly fast (I've had 90Mbps, which I think is okay for a phone!).
But if you think buying a charger is ridiculous then don't. I wasn't forcing you to, or to change network.