You can travel on a 2nd class rail ticket in 2- and 3-person compartments, but travel in a 1-person compartment requires a 1st class rail ticket. (Some international services features additional deluxe sleeping car options, including showers.) The sleeping cars are a step up from the couchettes.

On Polish national rail (PKP Intercity), the primary difference between classes is seating density, comfort, and complimentary service. In Second Class, seats are typically arranged in a 2+2 configuration (four seats across the aisle) or 6-person compartments; it is a modern and clean experience with power sockets and Wi-Fi, but can feel crowded during peak hours. In First Class, the layout is a more spacious 2+1 configuration (three seats across), offering wider seats with significantly more legroom and additional padding. For those on premium Express Intercity Premium (EIP) Pendolino trains, First Class passengers receive a complimentary meal from a dedicated menu and two drinks (hot and cold), while Second Class passengers only receive a small bottle of mineral water. Additionally, the First Class carriage is usually situated closer to the dining car and features a dedicated steward for "at-seat" service. While Second Class is an excellent value for most travelers, First Class provides a much quieter, "executive" environment for long journeys across the country.