Just as the U.S. Navy is pulling away from the technology.
By Jeffrey Lin and P.W. Singer December 15, 2017
Type 055A
The Type 055A, shown here in this fan art, will have integrated electric propulsion, giving it enough electricity to carry energy-intensive railguns.
Nishikasaizoukan
China has been making under-the-radar advances in railguns and other electromagnetic technologies, a move that's particularly notable considering the U.S. Navy has just recently reduced its efforts developing this kind of technology.
USN Railgun
Despite previous plans to install this multi-megawatt railgun on the USNS Trenton,recent shifting budget priorities in late 2017 may mean that this railgun may never be carried on a U.S. Navy warship.
US Navy
As opposed to gunpowder, railguns use electromagnetic energy to sling out a projectile, which means there's potential for far greater speed and range—the equivalent of a cannon with missile effects. Essentially, a railgun is an electromagnetic-powered cannon that's fires hypersonic shells by applying parallel magnetic fields (or "rails") on the shells
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While the technology has received great attention in United States military circles, China is the nation producing the most unclassified, peer-reviewed electromagnetic launch research in the world. It's the type of public science that suggests China could field a range of military electromagnetic technologies in the future.
Chinese Railgun
This early Chinese railgun or coilgun (pre-2005) is part of Chinese electromagnetic research, which began in the 1980s. While railguns are relatively simple to build, the difficulty lies in scaling them up, as well as making the barrel durable enough for multiple firings.
Chinese Internet, via Strategy Center
What's more, in a presentation at the PLAN University in Wuhan (home to the land-based testing rigs for the Chinese aircraft carrier and the Type 055 destroyer) Rear Admiral Ma Weiming told Chinese experts in electromagnetic research that the countryhas made breakthroughs in key areas of electromagnetic applications, such as railguns and electromagnetic-assisted launch system (EMALS) catapults.
Admiral Ma noted that some of the breakthroughs were key to building an operational railgun. That could mean these innovations involve decreasing gun barrel wear, power storage and management, and/or energy efficiency.
J-15B
The J-15B, seen on a catapult prior to launch at the Huangdicun naval air base in Liaoning. The Huangdicun base is testing both steam and EMALS catapults for installation on the Type 002 aircraft carrier.
Chinese Internet
Equally notable is potential progress on the EMALS catapult. Compared to traditional steam catapults that rely on compressed steam to vault aircraft, EMALS catapults rely on magnetically propelled sleds. EMALS, compared to steam catapults, are more efficient and require less maintenance than the complex system of steam pipes. The EMALS catapult is likely to equip the second domestically built Chinese aircraft carrier, the CV-18, which will likely be launched sometime after 2020.
Universal Combat Ship
This photo is from a presentation by Rear Admiral Zhao Denping. It shows a streamlined, integrated mast superstructure for a large surface combatant. Admiral Ma proposed in 2017 that such a warship would equipped with lasers, railguns, and electromagnetically assisted missile launchers.
Hongjian
Railguns and EMALS catapults could make the Chinese Navy much more capable. Railgun-equipped warships can fire hypersonic projectiles to shoot down stealth aircraft and ballistic missiles, or bombard enemy ships and land targets from hundreds of miles away.
And EMALS catapults would allow Chinese aircraft carriers to launch a range of heavier aircraft, significantly increasing their strike power and range. That's not all. In 2016, retired Rear Admiral Zhao Dengping discussed plans for a follow-up warship to the Type 055; a "Universal Combatant Ship" that would be equipped with laser, railguns, and, most intriguingly, electromagnetically assisted missile launchers, which could increase missile range.
https://www.popsci.com/china-electromagnetic-railgun-catapults