There is only one railway station in Marrakesh, i.e. no suburban ones, so the only train journey your friend could enjoy is between Marrakesh and Casablanca, the railway system does not venture any further south, but maybe if she could adjust her affection to buses she could enjoy a long Supratours bus ride from Marrakesh down to the southern desert regions. Supratours is a subsidiary of the Moroccan railway company ONCF and from memory they offer a service as far south as Merzouga.
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