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Seems international free ride warking one of the followoing ways. I.e. to go to London two freefahrts is required.
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or freifahrt combined with special DB offer
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# 1. Loosen ticket to Denmark, Switzerland .... D from to all destinations
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# 2. use of every German station the ICE / TGV to Paris
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# 3. Use only the Thalys from Cologne to Paris
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# 4. Only the Euro Star from Brussels to London (without the use of ICE by a German train station to Brussels)
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# 5. solve a pure French rail journey in TGV