Zhenia National Express

The Zhenia National Express (Zhenian: 진국고속철도), commonly stylized as ZNX, is Zhenia's intercity network operated by the Zhenia National Railway Company (ZhenRail). It was constructed to connect major population centers located in both mainland Zhenia and the Danguk Peninsula, as well as linking major cities and distant segments of the Golden Arc region to Daedo in order to revitalize passenger transport via rail. With a length of almost 20,000 kilometers as of 2019, including conventional tracks with HSR service, it is one of the most extensive high-speed rail networks in the world.

Construction of high-speed lines in Zhenia began in the mid-1960s, with the first lines, the Daedo-Changan line, commencing service in March 1, 1974. Further developments resulted in the completion of the Trans Golden Arc line in 1981, the Shinhang-Ariul line in 1987 and later other developments, ultimately resulting in 94% of Zhenians living within 100 kilometers from their nearest high-speed rail station. ZhenRail currently defines the term "high-speed railway" as any line capable of passenger services at or exceeding 250 km/h on its routes, a definition that was revised in 2000.

The maximum speed for trains in regular service is at 400 km/h, although signal and infrastructure systems allow for a theoretical maximum speed of 430 km/h. While initial trains operated at speeds around 240 km/h, later trains brought up the average speed to around 350 km/h. trains fitted with, estimated to have a maximum speed of over 500 km/h, are currently under testing in the Daedo-Changan line as of 2019, with the first units expected to enter service in 2025.

Precursors


Initial plans for a high-speed train in Zhenia emerged as early as the late 1920s, during a period of Zhenian prosperity known as the Paramount Age of Zhenia. Existing passenger rail services, particularly those within the Danguk Peninsula and the Golden Arc, were facing congestion and were estimated to be unable to catch up against ever-increasing passenger rail demand. Express services, stopping at fewer stations than regular trains and thus cutting travel times, were operated in tandem with improved locomotives to speed up passenger service, but were simply not capable of handling the projected increase on passenger rail traffic. The problem intensified as a large number of existing rail lines became key routes in which the Zhenian expansion effort to southern Tarsis, resulting in even more congestion in several trunk routes.

With such circumstances in mind, the newly-established Ministry of Railways, formed by the nationalization of major Zhenian railroad companies, drafted a proposal in 1936 describing a 'bullet train' that would run on dedicated tracks and be far faster than any existing passenger rail lines at the time by improved locomotives and routes. The planned routes for said 'bullet train' closely mirrored that of major trunk lines that existed at the time, with the primary purpose of alleviating the load on conventional trunk lines. The plan also included direct connections to neighboring states that were within the Zhenian sphere of influence, as well as less friendly neighboring states, although it remains unclear it would've been ever brought to reality. All lines would be built in, which had been the most common railroad gauge in the nation since the turn of the century. The plan itself had won approval in the Sangseowon in 1938, receiving the go for governmental funding to make the construction happen.

While construction of said 'bullet train' lines in select areas began as early as 1939, all construction was halted by 1944 amid the dire Zhenian war effort in the Second Great War. Although no lines were completed by then, already-built segments as well as preemptively purchased plots of land were later used directly into the construction of the first ZNX lines after the war.

Despite being regarded as the direct precursor to the ZNX, the 'bullet train' proposal has a significant number of differences from the post-war plans that would later materialize into the ZNX:


 * While the ZNX today has been and is entirely electrified, the bullet train proposals in the 1930s had electrified segments only in long tunnels, while the remainder was planned to be non-electrified; later plans, however, had opened room for future electrification later in the 20th century. This reflected the strong opposition of the Zhenian Army on electrification, with claims that any attacks on Zhenian power stations and substations would cripple such an electrified network. Hence, almost all of the prototype locomotives planned to be used in the bullet train system were a mix of diesel and steam-powered locomotives.
 * All lines part of the ZNX today is electrified in 25,000V 60Hz, electrified segments of the bullet train proposal had plans to be electrified in 3,000V . This was because most of the already-electrified routes in the nation's rail network were electrified in 3,000V DC as well - such lines were re-eletrified into 25,000V 60Hz AC in the later half of the 20th century.
 * With the exception of mail trains delivering mail and light cargo, there are no freight services on ZNX lines as of today: the bullet train proposal also had the operation of freight trains in its routes in mind, also partly reflecting potential military usage of the route.
 * While plans for the ZNX, at least at its time of initial planning, were primarily centered within Zhenia, plans for the bullet train spanned across most of East Tarsis, reflecting Zhenia's sphere of influence at the time.

Resurrection and construction
After the war, passenger rail demand started to stall and eventually decline despite Zhenian economic resurgence and post-war recovery, partly because of the prevalence of road transport via automobiles and the rise of air transport via scheduled airline services across the nation. As a means to stimulate economic growth within the nation via rail and increase passenger capacity of rail, the Ministry of Railways called for a completely newly-built, railroad in 1958 to supplement existing passenger railroads. In the planning phase, the previously-forgotten 'bullet train' proposal from before the war served as reference to the new rail plans: like the bullet train, the new plan would comprise of dedicated high-speed lines for high-speed trains, thus effectively increasing scheduled speed and separating high-speed rail and conventional rail traffic. Unlike the bullet train proposal, however, the new network would be electrified and dedicated to accommodating high-speed electric trains, with the prediction that existing steam and locomotives will be phased out by the end of the century anyway. The proposal was approved by Kim Shimin on May 16, 1959, the same year the routes were finalized and land acquisition began. Most of the land plots acquired by the Ministry of Railways during the Second Great War, as well as already-constructed railroads, were directly integrated into the plan.

Some liberal politicians initially opposed the plans for such high-speed rail proposals, calling it 'an uneconomic overlapping investment on the nation's infrastructure in a time of economic resurgence', and instead vouched for the improvement of conventional railroads as well as further investment on the growing National Expressway network. Some politicians, siding with local authorities where ZNX lines were expected to pass through but not make stops on, often protested against the potential noise and vibration concerns once the railroad was completed, while often demanding against ZhenRail to construct stations in their respective areas. Some erupted into minor riots, although most opposition efforts were largely ignored and suppressed by the Kim Shimin administration while construction proceeded.

The first route built at the time was the Daedo-Changan route, although actual construction was mostly done in tandem with the Trans Golden Arc line. Construction in the Daedo-Changan line, in particular, became an exemplary case for the construction of all future ZNX routes. While some were built directly on level surfaces on land, a significant portion of the route was built on viaducts, bridges and tunnels, as dedicated tracks were used to separate high-speed rail from conventional rail traffic. Most tracks in urban areas were built at least 20 meters below the surface, in order to minimize contact with existing rail services. The process of construction across all areas was by itself an engineering feat; it was during the construction of this line that the Musudan Base Tunnel and Donghae Viaduct, the longest tunnel and viaduct in Zhenian history at the time respectively, had happened, while the network of high-speed rail tunnels under Daedo remain the single largest underground tunnel network in the nation. It is widely speculated that the emphasis to increase scheduled speed at the expense of more tunnels and viaducts alone had almost doubled construction time and cost from what was originally expected.

While construction of the Daedo-Changan route were completed by 1971, it would undergo extensive testing for the next three years. During testing, the initial trains reached a maximum speed of 240 km/h, well above the initial objective of 210 km/h - in scheduled service, however, the initial trains will operate at a maximum speed of 220 km/h. Additional data, including railway signalling and sustained high-speed runs along the network as well as know-how in adjusting timetables for high-speed rail schedules, were collected during the testing phase, later proving useful in the overall maintenance of the network in later years. First scheduled passenger service along the ZNX began on March 1, 1974 - a day still commemorated as National Rail Day in the nation.

Expansion
Following the opening of the Daedo-Changan route, construction of more ZNX-dedicated high-speed tracks, as well as the electrification and upgrades of existing tracks across the nation, spurred; the Trans Golden Arc line, spanning the entirety of the Golden Arc region from southern Balhae Province to Namhae Province, inaugurated in 1979, while the Shinhang-Ariul route, opened in 1985, connected the traditionally neglected Western Zhenia to the Golden Arc area. Advancements in breaking and motor technology, as well as improvements in the signal and safety systems, also led to improvements in speed: by 2000, all ZNX trains were operating at a maximum speed of over 300 km/h with the introduction of the ECU-320, while the speed limit was once again raised to 400 km/h in 2014 with the advent of the EMU-400 trains into service. A further plan to build lines between Daedo and Changan, as well as along the Golden Arc region, has been undergoing development since the 1980s, with initial service expected to begin in 2025.

Rails
All ZNX trains run on dedicated 1,435-mm rails, with the exception of using conventional standard-gauge rails in dense urban areas. At-grade road and pedestrian pathway crossings do not exist in all tracks served by the ZNX, adhering to the philosophy of minimizing outside interference on ZNX tracks; trespassing dedicated ZNX rails via means other than ZNX trains is strictly prohibited by law. Instead of going around obstacles like most older conventional tracks, ZNX tracks use tunnels and viaducts to go under, over and through them, with a minimum curve radius of 3,600 meters. The exits of ZNX tunnels are designed with the upper parts of the tunnel sticking out rather than the opposite, greatly reducing the boom.

ZNX tracks uses and  points instead of conventional switches to minimize gaps in order to terminate gaps at turnouts and crossings, while also minimizing vibration when operating at high speeds. Tracks are slab-like and ballastless, adding to the durability of the tracks when ZNX trains operate in high speeds; slab tracks are firmly added into concrete bed sections, supported by concrete upstands for increased stability. They are then joined by expansion joints to evade gauge fluctuation and deformation thermal elongation and shrinkage.

Stations
Many ZNX stations across the nation are large, enclosed aboveground structures resembling those of many airport terminals today in terms of size and layout, consisting of glass-covered concourses supported by steel girders and concrete columns, creating a large main hall to function as both the departure and arrival halls of the station. ZNX tracks, in most cases, run parallel to the length of the concourse, mostly on the rear and often away from the main level of the concourse to minimize the interference the tracks cause on the concourse. Most transportation options, including a driveway loop for buses, taxis and other automobiles, are available in front of the station, while urban rail lines are usually linked to the station via underground lines. While an array of benches, ticketing areas and other facilities form up a lion share of the main concourse, recent attempts to incorporate private capital into ZNX stations have resulted in department stores, cinemas and other cultural facilities becoming a part of the station.

The main concourse and the tracks are separated by a gate, where all passenger tickets are clipped for admittance. The platforms themselves are normally either covered with a large glass canopy altogether (along with the tracks) as a part of the concourse or are covered with canopies of their own, although the former is generally the case with larger stations. Overpasses or underpasses, depending on the station, connect the platforms in case the passenger to move to another platform. Although the platforms feature fewer amenities than the concourse, newspaper stands and small convenience stores are present on many ZNX platforms.

Power and Signalling
All ZNX trains are powered by electricity, relying on high-voltage suspended by  supplying electricity at, with each train receiving power from overhead lines via pantograph. The power from pantographs, in the case of, is distributed to each car almost evenly to reduce the load on the axles of power vehicles.

The Zhenia National Express employs the  system in tandem with a comprehensive system of  (ATP), which also includes an  system as an emergency safety measure. A centralized traffic control system manages the nationwide network, overseeing all tasks related to train movement, tracks, station and schedule. The entire system has been computerized by the early 1990s, while augmentation into the control system being introduced by 1995. In 2019, a new system employing broadband communication technology has been introduced in the Trans Golden Arc line, allowing for more accurate real-time tracking and control at the end of the central system.

Classes by Seating
The lowest but often the most common class available on the ZNX is the Standard Class. Primarily aimed for those with tight budgets, Standard Class seats normally arranged in a 2 + 2 seating configuration per row, while each passenger car has 18 rows. Each seat until the EMU-400 has a seat pitch of 960 mm (seats on the EMU-400 have a pitch of 980 mm), all of which are cushioned, adjustable recliner seats. Other amenities include cup holders, overhead storage, foot rests, electrical outlets via ports, onboard Wi-Fi since 2007 and  screens on every seat in newer trains. There has, however, been talks on densifying the Standard Class seats into a 3 + 2 configuration rather than the current 2 + 2 configuration. The Executive Class is a higher class found on ZNX trains, primarily aimed for businessmen and less budget-constrained tourists seeking higher quality than the Standard Class. With its seating arranged in a 2 + 1 configuration per row, all of which are separated by the 'Cell' partitions since 1999 to allow for greater privacy. Normally with 10 or 12 rows in each passenger car, seats in the Executive Class are lined with leather and are reclinable further than the Standard Class, with some newer trains being fully reclinable to 180 degrees. Other amenities in the Executive Class include a personal reading light, electrical outlets, provided headphones, complimentary snacks on shorter routes, screens and all other amenities on the Standard Class.

The highest possible seating class available on ZNX trains are the Sleeper Class, which operate on routes taking at least 10 hours at the speeds possible at given tracks. The necessity of the Sleeper Class on ZNX trains surfaced with the opening of the Trans Golden Arc line in 1981, when the estimated journey was expected to take almost 24 hours to complete, as well as the need to compete with airlines serving similar routes. The Sleeper Class exists in three variants - a personal compartment, a duplex compartment, and a 'quad-pod' compartment, each corresponding to the number of beds in a single given compartment. Although monetarily the most expensive seating class on ZNX trains, amenities of the Sleeper Class are objectively better than those of the other two classes.

Classes by Scheduling
Classes can also be classified according to scheduling, specifically depending on how many stops the train makes and the time the trains depart. Rapid trains (Zhenian: 특급열차), stopping only at major and designated stations, tend to complete the journey faster than their local counterparts, although they are around 10% more expensive than their Regular counterparts. Although the name should not be confused with non-ZNX trains, local trains (Zhenian: 각역정열차) stop at every ZNX-designated station and may often run on conventional tracks rather than dedicated high-speed tracks, resulting in 5-10% lower fares than their regular counterparts. Regular Trains (Zhenian: 일반열차) are the middle line between rapid and local trains, stopping at all major stations and some selected stations that vary by train and time - they are the standard for most pricing examples of the ZNX. Nighttime trains (Zhenian: 야간열차), are priced at around 20% lower prices than their daytime counterparts, although there is no such difference in Sleeper Class seats. Among these, rapid and regular trains are classified as C-level trains, while local and nighttime trains are categorized as G-level trains as per ZhenRail's passenger rail classification scheme.

Fares and Ticketing
In principle, all seats in the Zhenia National Express are priced proportionately by distance. As of January 2020, for a Standard Class seat, each kilometer costs a traveler around $0.25 on high speed tracks ($0.23 for every kilometer on a conventional track), with an additional ticketing charge equal to $3.40, a seating charge equivalent to around $5.00 (which is ignored if the traveler chooses the free seat option) and miscellaneous costs that add up to around $0.80 at the end of the traveler; in theory, the shortest possible ride on the Zhenia National Express on a kilometer-long conventional track would cost a minimum of $4.43 for the customer. Seats on the Executive Class increases the price per kilometer by 40% and the seating charge by 50%, while seats on the Sleeper Class on long-haul routes start from an additional equivalent of $100 for every 1,200 kilometers, have a seating charge equivalent to around $12.00 and cost $0.46 per kilometer on the customer. The total price excluding the ticketing charge would increase by 10% if the traveler chooses a 'rapid' level train, minimizing unnecessary stops in-between.

Both on-site and online ticket sales networks are available for purchasing the tickets on the Zhenia National Express; both processes are essentially the same, mostly differing in the medium through which the ticketing is done. At the end of the customer, the customer requests a certain quantity of tickets for a certain route and class, either one way or return; with input from the clerk (on-site ticketing) or through the online service (online ticketing), the system returns with the set of available tickets fitting the criteria, allowing for the customer to choose among them. After the ticket is generated through this process and the subsequent monetary transaction is made, the sale is completed. Combined tickets between ZNX and non-ZNX services are also available through a similar process, as the Zhenia National Railway Company operates both ZNX and non-ZNX services; however, it is directly compatible with most intra-urban public transport means such as subways. Tickets can be reserved up to 90 days in advanced and be cancelled without a cancellation fee until 24 hours before the train's departure. Cancellation is available through various means, although it does not have to be the same way the ticketing was originally done. A cancellation fee of 20% of the original ticket fee applies for cancellations between 24 hours and 6 hours prior to departure; the percentage rises to 40%, 56% and finally 100% (meaning that sales are final by such point) between 6 hours and 90 minutes, 90 minutes and 15 minutes prior to departure, and finally after the train's departure respectively.

Passenger Trains

 * J300: The first high-speed trains within ZNX service to break the maximum speed of 300 km/h.
 * J320:
 * G350: The first trains introduced in ZNX service, with a maximum speed of around 350 km/h.
 * G400: The most-recently introduced type of trains in ZNX lines. Essentially an improvement of the EMU-350, it has improved in maximum and operational speed, acceleration and deceleration rate and tilting capability.

Exports
In August 2018, the Zhenia National Railway Company announced the sales of a total of 322 EMU-400 vehicles and associated training services to the Great Northern Lines, which primarily services the nations of Educandi and Grothbord. The first EMU-400 trains are set to be delivered in Educandi in February 2020 and would operate through intercity routes between major cities of the nations, including the high-demand route between Edurre and Volkstadt.

Western Line Extension Plan
The Seobu High-Speed Line plan is set to form the new core of the extension of ZNX services into a dedicated high-speed line between Ariul and Jangsan, as well as smaller western cities in-between.

Maglev Line plan
There are proposals to build additional -dedicated tracks for future Maglev trains to significantly cut down traffic time.