Every country has it’s specific name for High(er) Speed Trains.
- Italy: Frecciarossa, Frecciargento, Frecciabianca (often abbreviated as “FR”)
- France: TGV (Inoui, Lyria, Ouigo,...)
- International Traffic to the UK is Eurostar; to Belgium, the Netherlands, and some cities in Germany = Thalys
- Germany = ICE
- …
IT = Italy.
A day trip Brussels is doable from Amsterdam, try to avoid Thalys. Best not try to squeeze it in when you’re travelling to London as you need qa lot of time for the passport and secutaintment checks when travelling to London. Otherwise you only get to see the clichés in Brussels, while it has a lot of nice museums too worth visiting.
Milan → Rome = Fastest route is by Freccia-trains, reservation needed.
Rome→ Florence → Pisa → Rome = Partly by Freccia-trains, reservation needed for some trains
Rome → Milan → Freccia-trains, reservation needed.
Milan → Venice → Milan, by Freccia, reservation needed.
Amsterdam → Brussels → Amsterdam = If you take the hourly IC Brussels Amsterdam, no reservation needed. (You cannot take Thalys, unless you make a very expensive seat reservation. It’s not worth it between Brussels and Amsterdam).
Amsterdam → London = Eurostar, reservation needed. Make these asap.
London → Paris = Eurostar, reservation needed, Make these asap.
When are you travelling?
Best take a look into this topic to get seat reservations for your aforementioned connections, without a booking fee