A travel class is a quality of accommodation on public transport. The accommodation could be a seat or a cabin for example. Higher travel classes are designed to be more comfortable and are typically more expensive. Airlines Traditionally, an airliner is divided into, from the fore to aft, first, business, and economy classes, sometimes referred to as cabins. In recent years, some airlines have added a premium economy class as an intermediate class between economy and business classes. Each class is further divided into invisible booking or fare classes, which although booked into the same cabin differ in conditions and benefits outside of the cabin class travelled, such as frequent-flyer points, baggage limit, change or refund policy, etc. Ocean liners Before cruise ships dominated the passenger ship trade, ocean liners had classes of service, often categorized as First Class, Second Class, and Steerage. Companies such as Cunard Line continue this tradition, offering Queen's Grill, Princess Grill and Britannia cabins, each of which have their own allocated lounges and restaurants on board. Trains Trains often have first class (the higher class) and second class (known as standard class in the UK). For trains with sleeping accommodations, there may be more levels of luxury. China Traditional trains commonly offer the following classes: soft sleeper, hard sleeper, soft seat and hard seat, depending on the route. China Railway High-speed (CRH) EMUs offer the following classes: soft sleeper (available only on few overnight routes), business seat, 1st class seat and 2nd class seat. Taiwan Prior to 1949, most railway bureaus (under the direction of the Transport Ministry) had a three-class structure. As with most contemporary cases, few people could afford first class or even second class, so at times there would be no first class or second class service available in some trains. Some went as far as offering a fourth class "service" with goods wagons. In 1949, the first "Limited Express with Reserved Seating" (特快對號車) appeared with the Railway Bureau of Taiwan, and it offered a three-class service, inherited locally from Japanese colonial rule. This structure was the norm for all trains, normal or express, until 1953. In 1953, the "Equality Express" was introduced with second class carriages only. Eventually, all expresses save for the sole Limited Express offered only second class service, and all other, slower trains, offered only third class. This resulted in the quality of service being associated with the