Paris to Nice by train
Paris to Nice by TGV in about 5h45m over 578 miles. Tickets start from €45 in second class or €79 in first class when booked early.
Geneva to Zermatt by train
No direct Geneva–Zermatt train — change at Visp. Journey takes 3.5–4 hours through Lausanne, Montreux and Sion to the Alps.
Munich to Salzburg by train
Munich to Salzburg by Railjet in as little as 1h28m. 37 daily services from €6.99. The Bayern-Ticket is the best-value option for groups.
Berlin to Paris by train
Berlin to Paris by train in 7h38m (fastest) to 8–9h. ~22 daily departures from Berlin Hbf to Paris Gare de l'Est, covering 545 miles (878 km).
Bilbao to Barcelona by train
Bilbao to Barcelona by Renfe Alvia in 6–7 hours. Tickets from €35–€85 one-way — book 45–60 days ahead for up to 65% off. Departs Bilbao Abando.
Madrid to Barcelona by train
Madrid to Barcelona by high-speed train in 2h29m to 2h52m. Up to 58 direct daily services on the 504 km route.