Editing High-speed rail (section)

==Closures==
The KTX Incheon International Airport to Seoul Line (operates on [[AREX|Incheon AREX]]) was closed in 2018, due to a mix of issues, including poor ridership and track sharing.<ref>{{cite web|url=http://www.globalconstructionreview.com/news/south-korea-closes-266m-high-speed-rail-line-passe/ |title=South Korea closes $266m high-speed rail line as passengers prefer the bus |work=Globalconstructionreview.com |date=16 August 2018}}</ref> The AREX was not constructed as high-speed rail, resulting a cap of 150 [[Kilometres per hour|km/h]] on KTX service in its section.

In China, many conventional lines upgraded up to 200&nbsp;km/h had high-speed services shifted to parallel high-speed lines. These lines, often passing through towns and having level crossings, are still used for local trains and freight trains. For example, all (passenger) [[Electric multiple unit|EMU]] services on the [[Hankou–Danjiangkou railway]] were routed over the [[Wuhan–Xiaogan intercity railway|Wuhan–Shiyan high-speed railway]] on its opening to free up capacity for freight trains on the slower railway.<ref>{{cite web|date=29 November 2019|title=今天，湖北多县市，告别无高铁历史！|trans-title=Officially opened to traffic! Today, many counties and cities in Hubei bid farewell to the absence of high-speed rail!|url=https://wap.peopleapp.com/article/rmh9705393/rmh9705393|quote=　　It is reported that in order to unleash the freight capacity of the Handan Railway and take advantage of the high-speed rail transportation, all the EMU trains running on the Handan Railway will be transferred to the Han-Dan Railway.}}</ref>

In India, the Regional Rapid Transit System (RRTS) network is being newly constructed to provide semi-high-speed rail connectivity between major cities and suburban areas. The RRTS corridors are designed for a maximum speed of 180&nbsp;km/h, with an operational speed of up to 160&nbsp;km/h.<ref>{{cite web|url=https://www.ncrtc.in/rrts-delhi-meerut/ |title=Delhi–Meerut RRTS Corridor |publisher=NCRTC |access-date=28 April 2025}}</ref> As these new corridors open, certain existing slower regional services, such as conventional EMU and MEMU trains, are planned for rerouting, rationalization, or reduction to prioritize the faster RRTS services. For example, after the opening of the Delhi–Meerut RRTS corridor, some regional services between Delhi and Meerut are expected to be scaled back to optimize operations on the new high-speed corridor.