I was just watching the Masterpiece special with David Suchet on the Orient Express on PBS. I got to wondering what the frequency was during the time Agatha Christie wrote Murder On the Orient Express, Paris to Isstanbul. Was it weekly, or more or less frequent? I looked on Wickopedia but found nothing to answer the question. At 81+ hours it was a long trip but how frequently?
Thanks for any info you can provide.
George Lasley