Yes, the Lisboa Card provides completely free and unlimited travel on the CP (Comboios de Portugal) train lines to both Sintra and Cascais. This is one of the card's most valuable features for tourists. You can board the Sintra-bound train at major Lisbon stations like Rossio (most common for tourists) or Oriente without purchasing an additional ticket; you simply tap your activated Lisboa Card at the electronic gates. The journey takes about 40 minutes and would normally cost around €5 for a return trip. It is important to note that while the train to Sintra is free, the card does not cover the local Scotturb buses within Sintra (like the 434 bus that takes you up to Pena Palace), although it may provide small discounts on certain monument entries once you arrive. In 2026, many travelers also opt for the "Lisbon-Sintra Pass" which combines the Lisboa Card with "skip-the-line" entry to Pena Palace and the Moorish Castle for a more seamless day trip experience.