The BB 1800 were motor luggage vans of SNCF. These were the so-called "first-series" Z 5000 locomotives ordered by the Chemins de fer de l'Ouest. They were put into service, with running numbers Z 5001 to Z 5010, on 12 April 1900, on the line from Paris-Invalides to Issy-Plaine, which was extended to Meudon on 1 July 1901 then to Versailles RG on 31 May 1902.
