Here are two sites were people resell second hand train tickets:
Don’t forget to read the 5 best tips to find cheap Eurostar tickets.
And link to the official Eurostar site.
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Tales and tips from a real Eurostar Client 
You can also check:
http://www.trocdestrains.com/
Posted by Marine | March 1, 2011, 3:50 pmYou can no longer resell Eurostart tickets on KelBillet.They do not allow e-tickets and with physical tickets they ask for identifying info that their software must recognise.
Posted by mitmondon | August 22, 2012, 9:22 am