Clara’s seen amazing things travelling with the Doctor; some beautiful, some terrible, some mind-boggling, but this is something else entirely. She’s far into the future, yet feels like she’s stepped back in time to a more glamorous age.
Train travel certainly isn’t like this in her time; it’s all extortionate fares, endless delays, and crowded carriages, but this is sheer class. Spacious, elegant, luxurious… It could almost be earth in the twenties; only the view through the windows shatters the illusion.
The blackness of space lies beyond the glass, the Orient Express thundering through it without needing rails. It’s incredible!