They have TASS.
But what that means is that if NR use their brain, they could re-use a lot of the existing equipment fitted as there is already a;
Eurobalise Antenna
EVC
NVC
I beleive they have RADARs.
Speed Probes.
Hence, the ancillary equipment could all be re-used for a 'full fat' ETCS installation, and even if not, the wiring routes and racking locations could be re-used, provided some silly requirements don't get put in the way of just re-using existing locations.
Those who work on ETCS for NR, know.