China's latest bullet trains will reach a blazing 400 km/h, faster than the Hyperloop One (for now)

China has officially reclaimed the title for world's fastest train.

Come September 21, new bullet trains will be blazing their way across China at speeds of up to 400 km/h (248 mph).

Consider this China's comeback, after a two-train collision in 2011 that killed 40 people. The top speed at the time was 350 km/h, but authorities throttled them to 300 km/h after the fatal accident.

The new trains will be returning to the 350 km/h speed, but according to state news outlet Xinhua, they're capable of going even faster, at a maximum speed of 400 km/h.

To put that into context, here are five things that are slower than China's new bullet trains:

The Hyperloop One (so far)

NORTH LAS VEGAS, NV - MAY 11: Hyperloop tubes are displayed during the first test of the propulsion system at the Hyperloop One Test and Safety site on May 11, 2016 in North Las Vegas, Nevada. The company plans to create a fully operational hyperloop system by 2020. (Photo by David Becker/Getty Images,) Credit: Getty Images

The Hyperloop One, which is still in development, reached a speed record of 308 km/h (191 mph) earlier this year.

But stay tuned, it hopes to eventually hit its planned mark of 1,200 km/h in the future.

A McLaren F1 car

BUDAPEST, HUNGARY - JULY 29: Fernando Alonso of Spain driving the (14) McLaren Honda Formula 1 Team McLaren MCL32 on track during final practice for the Formula One Grand Prix of Hungary at Hungaroring on July 29, 2017 in Budapest, Hungary. (Photo by Dan Mullan/Getty Images) Credit: Getty Images

The McLaren F1 XP5 set a world record for the world's fastest production car in 1998, reaching 386 km/h (240 mph). It went on to hold the title for more than a decade.

A Peregrine falcon

HEREFORD, UNITED KINGDOM - JULY 1: A Peregrine Falcon is seen on display at Hereford Castle Green on July 1, 2017 in Hereford, England. PHOTOGRAPH BY Jim Wood / Barcroft Images London-T:+44 207 033 1031 E:[email protected] - New York-T:+1 212 796 2458 E:[email protected] - New Delhi-T:+91 11 4053 2429 E:[email protected] www.barcroftimages.com (Photo credit should read Jim Wood / Barcroft Images / Barcroft Media via Getty Images) Credit: Barcroft Media via Getty Images

Also known as the fastest bird in the world, the Peregrine falcon can go up to a staggering 389km/h (242 mph) when it is diving down to catch prey.

The falcon has pointed wings and an incredibly efficient respiratory system that allows it to move at the speed that it does.

The world's fastest ambulance

Visitors look at a first responder Lotus car at the Gitex Technology week in Dubai on October 15, 2014 . Dubai Ambulance added the sports Lotus car in addition to the two Ford Mustangs to its fleet and they are fitted with 60 per cent of the medical equipment that you would find in a normal full size ambulance. AFP PHOTO/ KARIM SAHIB (Photo credit should read KARIM SAHIB/AFP/Getty Images) Credit: AFP/Getty Images

Okay, so it's not a regular "ambulance," but the Lotus Evora, which has been refitted by Dubai's Corporation for Ambulance Services, can reach up to 300km/h (186 mph).

According to the DCA, the ambulance is equipped with "basic medical devices," and can reach a victim in mere minutes.

The world's scariest water slide

Mandatory Credit: Photo by Charlie Riedel/AP/REX/Shutterstock (6123641e) Riders are propelled by jets of water as the go over a hump while riding the world's tallest water slide called "Verruckt" at Schlitterbahn Waterpark, in Kansas City, Kan. The 168-foot-tall waterslide is scheduled to open to the public Thursday, after initially being slated to open May 23 Worlds Tallest Waterslide, Kansas City, USA Credit: Riedel/AP/REX/Shutterstock

You might want to close your eyes for this one.

The Verruckt, which is located in Kansas City, has been officially verified by Guinness as the world's tallest water slide.

Standing at 51.3m (168 ft), you'll reach speeds of up to 104km/h (65 mph) while hurtling down its tubes.