The DX number is a number, assigned by the International Imaging Industry Association, that uniquely identifies the type and manufacturer of a film emulsion. A list of assigned DX numbers for APS and 135 film is issued anually.
See also, but not to be confused with, DX encoding
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... all of which were at the far end of the Metropolitan Line, and stretch the definition of "tube station" a little:
Waddesdon tube station[?]
Quainton Road tube ...