The best replacement for tgv is ice.

The best alternatives to tgv are rated as following:
★★★★★  ice
★★★  gsc
★★★  thalys
★★★  shinkansen
★★★  eurostar
★★★  maglev
★★★  idtgv
★★  bullet train
★  ice train
★  ter
★  lgv
  rer
  eurail
  acela
  sncf

Your alternative for tgv is not listed? Suggest!
Speaking about tgv, one probably shouldn't forget about eurail pass.

Other search terms related to tgv and their ratings are:
★★★★★ eurail pass
You have in mind a companion for tgv and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of tgv in all years. Click on graph for more.
tgv
ice
gsc