Mk2 Jet Train (RTG) on private rails:
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"Turbotrain" service (probably the 1573/2) from Strasburg to Lyon Perrache, seen leaving the Strasburg-Mulhouse main line, entering the private network of MDPA (Potash Mines). 
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This diversion was due to the reconstruction of a bridge on the main line between Bollwiller and Richwiller.
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Bollwiller.
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Winter 1978/1979.
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Photo by Michel Ledieu (michel.ledieu@wanadoo.fr) (Acknowledgements).
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Posting and comment by P.L.Guillemin (plguillemin@yahoo.fr).