Fimm
For the most part, all the trains ive been on have been standard UK ones, wifi and power on board.
I did have an interesting experience fairly recently where I had missed my trains, but at both stations a strange late 90s esque train appeared and took me to the next one. Was very interesting seeing such an old couple of trains that were also quite modern.
They werent listed on the website as coming, nor were they on the stations list of trains for that day. It was very odd but it worked out for me so I'm happy that it did.