Originally Posted by
stut
I don't know the TGV Duplex, but there is often also luggage space between back-to-back seats where the direction switches over. Or sometime these are taken up with litter bins.
There's very little space there on the duplex, but Lyria doesn't use Duplex and there is lots of room over your seat for luggage. But make sure you board very early if it is a busy time or all the overhead space will be taken. You can usually board 20 minutes before departure at the origin of the train.