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Linghang is 15.4 meters in diameter, 148 meters long, and weighs 4,000 tons. It is crossing the Yangtze soil to reduce the Shanghai-Chengdu journey from 12 hours to 6.7 hours.
The Linghang tunnel boring machine, named “Voyager” by Chinese engineering, is currently excavating a railway tunnel 89 meters deep under the Yangtze River.
In fact, the section will connect Shanghai to Taicang, in eastern China.
According to ECNS, the work accelerated in March 2026 and is expected to complete the raw advance by the end of this year.
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According to the schedule, the tunnel has a total length of 14.25 km and supports trains up to 350 km/h.
On the other hand, in Brazil, the Ferrogrão project has been stalled for over 16 years. The difference in execution between the two countries is the real headline of this work.
The Linghang tunnel boring machine holds three world records
According to CGTN, the Linghang tunnel boring machine holds three global records for high-speed tunnels.
In fact, the first record is the diameter: 15.4 meters. This is the largest direct cut ever operated by an HSR machine anywhere in the world.
Secondly, Linghang holds the record for the longest excavation distance with a single cutter head for high-speed rail: 11.3 continuous km. Other HSR TBMs are below 5 km in this metric.
Consequently, the third record is for the depth under the river. The 89 meters under the Yangtze riverbed represent the deepest point of a railway line built to date.
148 meters long and 4,000 tons of machine
The machine is a factory-scale industrial structure.
According to the manufacturing technical bulletin, it is 148 meters long and weighs approximately 4,000 tons.
According to Interesting Engineering, the machine comes with an intelligent excavation system.
Furthermore, it features high-pressure hydraulic sealing to withstand the upstream river load. The system ensures the tunnel’s integrity even under billions of tons of water.
To understand the scale, 4,000 tons is equivalent to almost 700 urban buses lined up. The assembly logistics required a launch shaft more than 30 meters deep.
From Shanghai to Chengdu: nearly 6 hours cut from the journey
In parallel, the complete line starts from Shanghai and crosses Jiangsu, Anhui, Hubei, and Chongqing before reaching Chengdu. The route traverses four different economic zones of mainland China.
According to CGTN, the Shanghai-Chengdu journey will drop from over 12 hours to about 6.7 hours. The Shanghai-Chongqing route drops to 5.3 hours.
In fact, the time reduction is a 50% cut in one of the country’s main east-west connections. In comparison, most domestic travel still relies on domestic aviation.
In turn, logistical integration is the operator’s stated goal. Cargo and passengers move from the coastal industrial hub to the interior in less than one shift.
Contrast with Brazil: Ferrogrão stalled and bullet train under discussion
According to official data from the Brazilian government, the Ferrogrão project has been without a work order since 2009.
In comparison, it would connect Sinop (MT) to Itaituba (PA) with 933 km of tracks for grain outflow.
In parallel, the Rio-São Paulo bullet train has been discussed in legislative cycles since the 2000s. Today, the project still awaits definition of a financing model.
Consequently, the contrast is direct: while Brazil debates, China delivered 5 new high-speed lines and surpassed 50,000 km of HSR network.
In fact, this total is about twice the sum of all HSR networks in the rest of the world.
According to infrastructure analysts, Chinese speed comes from three factors: industrial standardization, turn-key contracts, and delivery times dictated by centralized planning.
Six geological faults in the tunnel boring machine’s path
Furthermore, the Linghang tunnel crosses six distinct geological faults along its 14.25 km path. This is one of the most complex sections of current Chinese underground engineering.
According to the technical report, prefabricated concrete rings with a diameter of nearly 15 meters are installed in sequence right behind the cutter head. Each ring weighs hundreds of tons and is installed in a few hours.
In fact, the tunnel gains its definitive structure as excavation progresses. This method eliminates the risk of partial collapse in fault zones.
According to the Global Times, Linghang has already passed the 10,000-meter mark excavated under the Yangtze.
Impact: China-Brazil logistical integration and execution standard
- 89 meters deep under the Yangtze River bed
- 15.4 m cutter diameter — largest in the world for HSR
- 14.25 km total tunnel, 13.2 km done by TBM
- 148 m × 4,000 t machine
- 350 km/h projected operational speed
- 6.7 h Shanghai-Chengdu journey — over 5 hours cut
In fact, to understand the impact, the reduction from 12 to 6.7 hours means allowing same-day round trips between China’s two largest economic hubs.
In fact, the Chinese strategy follows the pattern seen in Linghang’s 10,000 m mark under the Yangtze: closed contract, given deadline, specialized machine.
Caveat: The Linghang tunnel boring machine still has 4 km to go
According to the official schedule, Linghang’s raw excavation will finish by the end of 2026. The installation of permanent track and electrical system will follow.
On the other hand, the effective commercial operation of the new line is estimated for 2027-2028. The schedule depends on commissioning tests of the underwater section.
Will Brazil have at least an equivalent to this section in a decade? The question always resurfaces when a new phase of the Chinese project enters international news.
Nevertheless, the machine has already set three world records at once. The international railway sector is following the learning curve to define the next global technical standard.
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