India’s Bullet Train Corridor Introduces Japanese Swing-Nose Crossings (Image Courtesy: NHSRCL)
NEW DELHI: India’s first high-speed rail project, the Mumbai-Ahmedabad corridor, will use specialised movable crossings and dual point machines that allow trains to switch tracks smoothly and safely at design speeds of up to 320 kmph.
The National High-Speed Rail Corporation Limited (NHSRCL) has highlighted the technology as a critical departure from conventional railway systems and a key enabler for reliable high-speed operations.
The 508-kilometre corridor, being developed with Japanese Shinkansen technology, is expected to begin testing on priority sections in 2027. NHSRCL recently released explanatory material and a video demonstrating how the advanced turnouts function near stations and depots.
Why Conventional Track Switches Are Inadequate at High Speeds
On traditional railway lines, trains change tracks through fixed-crossing turnouts. At the point where two rails intersect, a permanent gap exists that the wheel must bridge.
At speeds above 250–300 kmph, this discontinuity generates high dynamic impact forces, increased vibration, structure-borne noise, accelerated wear on wheels and crossings, and a higher risk of irregular wheel behaviour.
Such conditions are incompatible with sustained commercial operations at 320 kmph. Fixed crossings force trains to slow significantly before switching, undermining the efficiency and comfort expected of a bullet train service.
How Movable Crossings Work
The Mumbai-Ahmedabad High-Speed Rail (MAHSR) project is introducing movable crossings, also known as swing-nose crossings, for the first time on the Indian railway network.
In this system, a movable section of rail (the crossing nose) physically shifts in coordination with the switch rails. This creates a continuous, gap-free running surface that provides uninterrupted wheel guidance through the entire turnout.
NHSRCL stated: “For the first time on the Indian railway network, the Mumbai-Ahmedabad High-Speed Rail (MAHSR) project is introducing turnouts equipped with movable crossings (also known as swing-nose crossings). This technology is a fundamental requirement for safe, reliable operation at design speeds of up to 320 km/h and represents a decisive departure from fixed-crossing turnouts used on conventional railway lines.”
The continuous surface significantly reduces impact forces, vibration and noise inside the train, while also lowering wear on both the track infrastructure and the train’s wheels. The result is a smoother ride for passengers and longer intervals between maintenance interventions.
Dual Point Machines and Multi-Layer Safety Checks
Each high-speed turnout is equipped with two independent point machines. One machine operates and locks the switch rails; the second operates and locks the movable crossing nose. Both machines receive a coordinated command from the interlocking system and must move and lock simultaneously.
Multiple independent detection layers continuously verify three critical conditions: correct final position of the switch rails, correct final position of the movable crossing, and secure mechanical locking of both components.
Only when all checks confirm that the turnout is correctly set and locked does the signalling system release the route for the train. If any condition is not met, movement through the turnout is blocked.
This multi-layered approach meets the high safety integrity levels required for high-speed rail operations.
Part of a Broader Shinkansen Technology Package
Movable crossings form part of a larger suite of Japanese technologies being adapted for Indian conditions. These include canted (banked) turnouts that maintain track superelevation through the switching section, Japanese J-Slab ballastless track designed to handle extreme dynamic forces, and a 2×25 kV auto-transformer overhead electrification system optimised for heavy power demand at high speeds.
Together, these systems are intended to deliver the ride quality, safety and asset longevity associated with Japan’s Shinkansen network while creating a knowledge and industrial base for future high-speed corridors in India.
The Mumbai-Ahmedabad corridor was formally agreed with Japan in 2015. Railway Minister Ashwini Vaishnaw has indicated that testing is expected to begin in May-June 2027, with commercial operations targeted for the end of that year on completed sections. Once operational, the service is projected to cut journey times dramatically.
By introducing movable-crossing turnouts and dual point-machine architecture, the project addresses one of the fundamental engineering challenges of high-speed rail: enabling trains to change tracks without sacrificing speed, safety or passenger comfort.
The technology marks a tangible step in transferring proven Shinkansen practices to Indian soil and lays technical groundwork for the expansion of high-speed rail across the country.
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