The Mystery of the Blue Train is a BBC Radio adaptation of the novel with the same name. The adaptation was written by Michael Bakewell and directed by David Johnston. Broadcast between 29 December 1985 and 2 February 1986.
- Maurice Denham as Hercule Poirot
- Janet Maw as Katherine Grey
- Robert Beatty as Rufus Van Aldin
- Avril Clark as Ruth Kettering
- Anthony Smee as Derek Kettering
- Michael Deacon as Major Knighton
- Gwen Cherrell as Lady Tamplin
- Moir Leslie as Lenox Tamplin
- Peter Woodthrope as Dr Harrison
- Judy Buxton as Mirelle
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