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In page The Mystery of the Blue Train:

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The novel was adapted for television in 2006,[1] a special episode of the series Agatha Christie's Poirot, airing on ITV on 1 January.[citation needed] It was adapted by Guy Andrews and directed by Hettie Macdonald (who would later direct Curtain: Poirot's Last Case), and starred David Suchet as Poirot.[1] Also featured were Roger Lloyd-Pack as Inspector Caux, James D'Arcy as Derek Kettering, Lindsay Duncan as Lady Tamplin, Alice Eve as Lenox and Elliott Gould as Rufus Van Aldin.[2] It was "[r]eset in the late 1930s to match the rest of the Poirot TV series".[1]