There is the Doctor Who episode "Mummy on the Orient Express" which is imo one of Peter Capaldi's best episodes
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If TTRPGs are your bag, Call of Cthulhu's Horror on the Orient Express is quite well regarded. It regularly comes up in discussions about the best campaigns of all time, all game systems considered.
[General thoughts]
https://bookshop.org/beta-search?keywords=rex+stout&bkshp-astro=t
Rex Stout's Nero Wolfe mysteries were written at the same time as Christie's novels.
Wolfe is a sedentary iconoclast who seldom leaves his Manhattan townhouse. Instead he sends Archie Goodwin out to follow up on clues and bring home witnesses to be interrogated.
Seconding the Nero Wolfe books, they're absolutely superb. Archie is a brilliant narrator.
Someone else pointed out that these days the early Nero Wolfe books read like historical fiction. In one of the stories from the 1950s there's a description of how watching television was considered a lively thing to do at a fancy party.
Does A Hat In Time's "Murder on the owl express" count?
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