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I've just looked into how the onboard network and backhaul is desigend on the Thalys. According to press releases it's 21Net who have delivered the solution for intrain connectivity.
They basicly have two concepts: "Sat 21" where a so-called "brain car" hosts all the backhaul equipment and hands on connectivity through wireless or wired (with up to 10 GBit/s! through fibre) links to the next carriage and "Modular 21" where each carriage has its own wireless backhaul through a terrestrial network (potentially even using different cellular networks) and a wireless mesh network is used to balance traffic among all carriages' uplinks (see "specifications" tab unter http://www.21net.com/products/sat-21 and http://www.21net.com/products/modular-21).
In both cases it may be worth checking connectivity in other carriages (especially in the brain car with the satellite hump on the roof) as the inter-carriage links or in case of "Modular 21" the mesh network could have failed. Anyway Thalys should get their homework done as the flying competition is adapting inflight connectivity with increasing pace.

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