Boîte mobile

A boîte mobile, or mobile box, was a mailbox attached to a railroad carriage, stagecoach or steamship to allow mailing letters in places without easy access to a post office. Mail in France picked up this way was marked "B M". Mail in Great Britain was marked "MB" or with similarly coded cancels.

Similar to paquebot mail, incoming steamship mail with foreign postage would be cancelled with boîte mobile postmarks.  File:Boite mobile A.jpg|French boîte mobile marking in use from 1852-1912. File:Jersey MB cancel on France.jpg|Jersey mobile box cancel on French stamp. 

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