have you been on any memorable train rides?

I took the Alishan forest railway from Chiayi to Fenqihu in Taiwan. The train sways a lot and you can often feel your carriage jolting forward and backwards into the other carriages, was fun. It also had 4G signal the whole way through all the mountains and shit (excluding a couple of tunnels) which means you can read about the accidents that killed people as you ride past the remains of the landslides. My third world country (UK) hasn't quite managed to figure out having connectivity on a train beyond the point of a few seconds after leaving the train station yet

Yes, but maybe not the sort you are looking for. I was with a group doing a couple of festivals in China, we went from Beijing to Weifang overnight by train. The guy who booked tickets fricked up, he was supposed to get "soft class" tickets, but two of the tickets were "hard class." He took one of them, and since I was traveling alone (the rest were couples or teammates) I volunteered to use the other.
At first the Chinese folks back in hard class were pretty confused as to why the frick I would be there, but once it became clear that I was not lost and was really traveling with them, they were amazingly welcoming. Almost none spoke English -- there was one guy who had a kid going to an American college in my home state, and an English teacher, and they sort of translated for me. Everybody wanted to ask about what I was doing and where I was going, and share snacks and drinks with me, and we generally had a fine old time.
Meanwhile, the folks traveling soft class went to bed and didn't have any sort of memorable time, good or bad, on that train.

pretty mundane but the shinkansen from Tokyo to Kyoto has perfect view of Fuji

In April 1984, Jammeh joined what was then the Gambian National Gendarmerie as a private. He was part of the Special Intervention Unit from 1984 to 1986 and was an escort training instructor at the Gendarmerie Training School from 1986 to 1989. He was promoted to sergeant in April 1986, and to cadet officer in December 1987.

The last stretch of the Empire Builder Amtrak is quite nice. I also like the Southwest Chief for the most part. The Texas Eagle/Sunset Limited sucks and the coastal one in California is underwhelming.
I like the train from Verona to Trento through the Alps. Also regional trains in Japan, the one to Matsushina frok Sendai and Yamagata from Sendai are wonderful - former should be taken in afternoon, latter in morrning.
The downtown loop in Chicago is probably my favorite inner city train, European and Japanese metros can be amazing but they're indoors so don't produce memorable views. There's a line in NYC (C?) that goes over East River on a bridge, like that one too.