Experimental Jet Train TGS ("Turbine à Gaz Spéciale").
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This set was formed with:
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• a power car from a Class 4300 DMU (X-4365);
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• a trailer from a Class 4500 DMU (XR-8579).
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Whereas the former (TA-101) retained its original Poyaud engine (330kW) and mechanical transmission, the later (TAD-102) was remodelled with a Turmo III C3 turbine (810kW) and hydraulic transmission.
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Both cars got new bogies (Y214), with high-power brakes.
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TGS ran various trials from 1967 to 1972, primarily to develop Mk1 Jet Trains (ETG). It eventually ran at 252km/h on 15th October 1971. 
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In 1974, it went through an extensive refurbishment for VIP services, and was re-liveried to RTG standards. It unfortunately quit service in 1984, and was scrapped in 1990.
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The power car on this pic is TAD-102.
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Le Mans.
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7th October 1989. 
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Photo by Georges Nadeau (Acknowledgements)
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# geon77@hotmail.com
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Posting and comment by P.L.Guillemin (plguillemin@yahoo.fr)