TGV 9864 (Nice Ville-->Bruxelles Midi/Brussel Zuid), seen at Tuileries Jct, where the Marseilles-Paris HSL branches off the conventional line.
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This formation features:
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<li> a TGV Réseau (Tri-voltage) set, at the rear, running from Nice to Brussels, and
<li> a TGV Duplex set (Dual-voltage) set, at the front, diagrammed as a matter of relief on Marseilles-Lille.
</ul>
At this stage, this formation is already running on the HSL ("Up" track), with all pantographs down, owing to the voltage change-over (1.5kV DC--->25kV-50Hz AC). 
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The front half of the Duplex set is already running under 25kV.
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This formation is about to enter the Marseilles HSL tunnel, currently the largest French domestic railway tunnel (7,836m).
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This TGV service holds a 3-fold absolute record, as it is:
<ul>
<li> the most veteran Brussels-French Regions TGV service, introduced on 28th May 1995;
<li> the largest-distance TGV service, with 1,287km-800mi throughout;
<li> the service which uninterruptedly cumulates the highest HSL mileage in Europe, with 1,046km-650mi of HSL from Tuileries Jct here until Lembeek (Belgium), not even switching to conventional tracks on Grenay-Sathonay to call at Lyon-Part Dieu.
</ul>
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Marseilles (Tuileries Jct).
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29th January 2005.
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P.L.Guillemin (plguillemin@yahoo.fr)