Mk2 Jet Train (RTG), seen on "Turbotrain" 6673/2 (Lyon Perrache-->Strasbourg), seen in the Doubs Valley, between Besançon and Montbéliard.
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At this stage, the valley becomes wider and fewer twisty, so that RTGs would speed up from 100 to 115km/h at this place. 
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Loco-Hauled formations would (and will) speed up from 90 to 110 km/h only...
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Pompierre.
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February 1990.
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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).