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.
Airline booking codes 
While an airline may only have two or three classes of service, they will use approximately ten to fifteen different booking codes in order to control the amount of each fare level sold. The booking code used by airlines and agents is typically (but not always), the first letter of the fare basis shown on the ticket and in industry fare displays.
Historically, airlines only used a few codes, and these were almost identical across the industry. Typical examples were F or P for First Class, J or C for Business, and Y for economy. With the advent of cheaper fares and more frequent travel, airlines increased the number of available fare types and the number of booking codes required to differentiate among them.
There is now no industry standard with regard to airline booking codes, although the Y code is almost always still used for unrestricted economy travel.
Most low-cost carriers have greatly simplified the fare classes they use to only a few codes, unlike full-service airlines, which use many more.
In Mexico, bus services often have designated levels of service, the top of which is de lujo or clase lujo, followed by plus clase, primera clase, and segunda clase.
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 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, Republic of 
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 speed of the train. The Diesel Limited Express was introduced in 1956 with one class only.
In 1960, with the reforming of Limited Expresses (the Limited Express with Reserved Seating and Diesel Limited Express merged into one fare,) all passenger trains officially offered only one class. Therefore, all expresses had only second class carriages and other trains only third class. As time passes, more types of carriages were introduced, but these were thought as types instead of classes.
There are generally two classes, known as "first class" and "second class", or the equivalent in the local language. The three-tier class structure was abolished on most European railways in the 1950s in favor of a two-tier structure.
Trains in the United Kingdom provide a two-tier class structure, with the higher tier called "first class" and the lower tier "standard class". The lowest tier was branded "second class" by British Rail from the 1950s until the late 1980s.
A convention used by most European railway companies is that the first-class section of a train is marked in yellow, usually with a yellow band above the doors and/or windows. First-class areas may be complete carriages or at one end of a carriage, the other end being second class. Second-class compartments usually have "2+2" seating (2 seats each side of the aisle); first-class compartments are typically "2+1". In Britain and France, some short-distance Suburban trains use "2+3" for Second Class and "2+2" for first class.
Metro, suburban and local trains are sometimes second-class-only. First-class-only trains were common up to the 1980s (see Trans Europe Express) but are now rare. High-speed trains often charge more than slower-speed trains on the same route, but still have first- and second-class seats.
Indian Railways offers six classes of train accommodation in general.
- First Class A/C (HA) is the highest rail travel class and is not available on all trains. It offers air-conditioned cubicles in two-bed and four-bed formats with close doors. There usually is only one 1A bogie (carriage) on a train.
- Two Tier A/C (2A) offers air conditioned cubicles in four-bed and two-bed formats, but the privacy is provided by curtains instead of the doors found in 1A. There are typically one or two 2A bogies on long-distance trains.
- Three Tier A/C (3A) provides air-conditioned cubicles with six beds. Most trains have two to five 3A bogies.
- A/C Chair Car (CC) is a feature of short-distance trains that cover the journey within a day. The seating is usually in 3x3 format.
- Sleeper Class (SL) is configured similarly to 3A but is not air conditioned. There are typically ten to fifteen SL bogies in a train.
- Second Class (SC) for long-distance trains is similar to the SL cars but has wooden middle berths instead of upper berths. However, local and suburban trains may offer a different variety of second class, which has an open cabin with rows of wooden seats facing each other in pairs.
Some trains also have one of these classes:
- First Class (FC), which is similar in configuration to the 1A class but lacks air conditioning. The class is currently phased out in favor of the slightly more expensive 2A and cheaper 3A classes. In 2011, it could be found only on a few trains across all of India.
- AC First Class, also called AC Executive Chair, has a 2x2 seat configuration and includes food catering service. It is available only on some of the "Shatabdi Express" trains, which link major cities located within a day-trip distance.
- Eksekutif (executive/First class) - offers the most comfortable means of travel - wide (2+2 airplane-like seating configuration) soft seats, air conditioning, food catering service (paid separately). Also, trains having eksekutif cars are certainly the fastest ones - see the note below.
- Bisnis (business/Second class) - medium level, ticket price is around 60% of eksekutif. No a/c, no food catering (but there may be food sellers coming on the stations), same seat width as in eksekutif, reserved seating, reasonably clean.
- Ekonomi (economy/third class) - the most basic and cheap class, tickets are 4-5 times cheaper than bisnis. Has reserved seating, can get extremely crowded, often dirty, especially in the toilets. Unlike in higher classes, no one really controls beggars, musicians and sellers, who will roam in these cars all the way. Chances of theft or other crimes are also much higher in this class.
Eksekutif trains are the fastest and stop only on a few major stations. However, the eksekutif train may also contain some bisnis cars, with slightly more expensive tickets than in bisnis trains. Bisnis trains are somewhat slower, but generally do not stop too often as well; there may be ekonomi cars in these trains. Ekonomi trains take significantly more time to reach the destination, as they stop on many smaller stations and have to pass all eksekutif and bisnis traffic going in the same direction. Many less important routes lack either bisnis or eksekutif service, or both.
For local trains, there's always an ekonomi service available, but in some areas there may be other classes as well. Around Jakarta metropolitan area, for example, there's Ekonomi AC service - besides air conditioning, it's much less crowded, cleaner, and is patrolled by security personnel while on the way. There may be also an Ekspres (express) service - generally same as Ekonomi AC, but with much fewer stops. All Jakarta suburban trains (including Ekonomi) have seats on the sides of the wagon, unlike in long-distance carriages. Commuter trains in Jakarta are operated by PT KAI Commuter Jabodetabek.
From 1872, Japan had a three-class structure for both seating carriages and sleeping carriages. By 1960, as conditions improve on second and third class trains, there were few passengers travelling on first class; therefore, the few remaining first class carriages were rebranded "special" carriages available for hire, and consequently moved Japan's railway system to a two-class system, of which the original second class became the first, and the original third became second.
In 1969, the class structure was abolished altogether. The first class was remained "Green" carriages and the second "Standard" carriages.
All members of the Japan Railways Group (JR) offer separated classes of travel, with varying levels of availability on any given train.
The Kyushu Railway Company (JR Kyūshū), Hokkaido Railway Company (JR Hokkaido), and East Japan Railway Company (JR East) all offer an enhanced service known as the Green Car on nearly all of their intercity trains. Additionally, the Central Japan Railway Company (JR Central) and Shikoku Railway Company (JR Shikoku) offer a Green Car on some trains, and a few West Japan Railway Company (JR West) trains also have a Green Car. The alternative to Green Car is the Ordinary Car. Although Ordinary Car tickets may be purchased with or without reserved seating, all Green Car tickets are reserved seating. A ticket must be purchased in advance, and a special version of the Japan Rail Pass allowing travel in Green Cars is available.
Most JR Group Green Cars seats have increased width and pitch. In some stations, Green Cars are located nearer to the staircases and escalators leading to/from the train platform. Green Cars also frequently offer slippers and reading materials in Japanese.
Additionally, JR East offers a third category of service, the GranClass, available on its Hayabusa route. Features of GranClass cars include leather seats that recline to a 45 degree angle, raised footrests, adjustable dining tables and cocktail trays, and personal reading lights. Full-service meals, both Japanese and Western, are provided by specialized GranClass attendants, who also serve soft drinks and alcoholic beverages. Because the Hayabusa is a long-distance service to the Tōhoku region, overnight amenities such as slippers, blankets, and eye masks are provided.
During the Victorian era, most trains in the United Kingdom had three classes of accommodation: first class (for upper-class people), second class (for middle-class people), and Third Class (for working-class people). From the 1870s onwards, second class (equivalent to either premium economy or business class) was gradually abolished, while first class and third class were retained. The reason that second class was abolished and third class retained was that the Railway Regulation Act 1844 required a third-class service to be offered. In addition to this, UK third class was initially of a comparable standard to continental European third class and UK first class with European first class (the continent having retained three classes). This meant that boat trains in the UK still often operated with three classes of accommodation long after abolishment of second class in the rest of the country. In June 1956, continental Europe joined the UK by moving to two classes and abolished third class: UK came into line by renaming third class "second class". In the 1980s second class was renamed "standard class", driven by the perceived negative marketing of "second class".
A coach with accommodation for more than one class is called a "composite coach."
In the United States, train classes emulate the airlines, although airlines probably took the class levels from trains of the time when they were coming of age (e.g. first, business, coach). Trains with sleeper cars have additional levels.
See also 
- First class (aviation)
- First class travel
- Business class
- Premium economy
- Economy class
- Passenger car (rail)
- IATA class codes
- "Types of Tickets | Ticketing". Jr-East. Retrieved 2013-03-21.
- "Japan Rail Pass: Green car or ordinary car? | Asia Forum | Fodor's Travel Talk Forums". Fodors.com. 2013-02-21. Retrieved 2013-03-21.
- "JR東日本 ｜ 東北新幹線E5系 ｜ About Gran Class". Jreast.co.jp. Retrieved 2013-03-21.
- "East Japan Railway Company". Jr-East. Retrieved 2013-03-21.
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