Class 81500 DEMU (B-81501) of SNCF-Action Régionale (TER Midi-Pyrénées), seen awaiting departure to Latour-de-Carol on TER 71477.
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As one can see on this pic, this dual-mode unit is to use electric-propulsion (1.5kV). 
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Yet, clearance expires at Ax-les-Thermes, as power supply further South is not commensurate with BGCs requirements, especially as this area features very steep gradients (40%o-1 in 25). As a result, this unit is to use Diesel-propulsion only on Ax-Latour.
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Toulouse-Matabiau.
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6th June 2005.
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Photo by Charles Perrin (pcflightsim@hotmail.com) (Acknowledgements).
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Posting and comment by P.L.Guillemin (plguillemin@yahoo.fr).