A solid story with some brilliant characterisation and use of time-travel, let down somewhat by a reliance on other stories for impact.

I've only listened to two stories with Charley Pollard, Storm Warning and The Stuff of Legend. I know a little about what ends up happening with her character, but generally, I don't think making the events of Charlie's story central to the finale here does this story any favours. It's not that the story makes no sense without the context of Charlie's continued adventures, everything is explained here pretty well, but it's not *felt* in the way that I think is intended.

My minor gripe with the story out of the way, I think this is a very fun story. The setting is a very nice change of pace from the first three, and does a great job of showing the impacts of time travel on 'lesser species'. Everything to do with the two trains was great ans made sense, I especially loved the idea that getting off and back on lets you switch to the dominant train.

The biggest point in this story's favour however is the characterisation, Romana and Narvin's banter is great, Sissy is suitably hateable, Torvald (real)'s interaction with Romana at the end where he realises she has to let him go is great, and Torvald (fake)'s interactions with Leela are brilliant. As others have pointed out, the confession being structured like wedding vows is incredible, and just works so so well.

I do wish Gallifrey leaned more into the politics rather than the espionage side of things that this first season has done, hoping for more of it in future, though this espionage side is done really well.

I think this may rank higher if I relisten to it after some more 8th Doctor stories, but for now it's a low 8/10.