Ore train in Mauritania
 

We are planning a trip to Morocco/Mauritania in 3 Land Rovers, in Dec 2003 to Marraketch - Dakhla - Nouadhibou - Nouakchott - Atar - Choum and back to NDB on the train. Any advice please. Dates of flat cars running west? I have info that this is only possible on Mondays. Is this correct? Any info on south/north border crossing please.