One of the best things about travelling by train is that nobody weighs your bag at the door. On CP intercity services there's no check-in process — you simply board with your luggage and find your seat. There are no extra charges for bags either. The general rule of thumb is to bring what you can carry yourself, keeping total luggage weight under around 30 kg per person. Just be considerate of fellow passengers in busy carriages.
Smaller bags and backpacks go in the overhead racks above your seat — same as any train. For full-size suitcases there are larger storage areas at both ends of each carriage, right by the doors. Worth knowing: nobody is watching these racks for you. Keep anything valuable with you at your seat, and don't leave your passport or wallet tucked inside a bag you can't see.
Bringing a surfboard down to the Algarve or a bike for the Douro Valley? You're not the first. Oversized items need a bit of advance planning — get in touch with CP before your travel date and show up at the station at least an hour and a half early. Station staff are generally helpful, but surprises don't go well when a train is about to leave.