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uST Transport and Infrastructure Solutions based on the Unitsky String Technologies Inc.’s patented engineering and know-how are characterized by high efficiency and minimal impact on the environment, as well as unprecedented reliability and safety in the transportation of passengers and cargo.

Operating principle

Transport and Infrastructure Solutions by Unitsky String Technologies Inc. are based on the technology of creating pre-stressed transport overpasses of a new generation, where the string rail is a key element. Such a rail is a steel or composite beam containing in its core a bundle of wires (strings) pre-stressed by tension and equipped with a rail head, along which passenger and cargo electric vehicles on steel wheels – uPods – move automatically at speeds up to 150 km/h (up to 500 km/h in the future).

Steel wheel:

  • differences from railway wheel pair: independent suspension, cylinder-shaped wheel supporting surface, flat rail working surface
  • 99,8% efficiency
  • no slipping in the contact patch
  • insignificant contact stress (about 200 Mpa)
  • minor wheel rolling resistance
  • symmetrical rail head wear

String rail:

  • absence of joints and temperature seams
  • high track evenness
  • comfort and smooth running
  • high movement speed
  • minimum material consumption

Steel wheel

Steel rail head

String (a bundle of pre-stressed by tension steel cords)

Special filler

Rail body

  • 1. Steel wheel
  • 2. Steel rail head
  • 3. String (a bundle of pre-stressed by tension steel cords)
  • 4. Special filler
  • 5. Rail body

The string rail track structure replicates the hanging bridge combining all of its primary components

String rail:

Support saddle

Rail body
(stiffening beam)

(special filler)

(load-bearing cable)


20 cm

20 cm

  • 1. Rail body (stiffening beam)
  • 2. Suspension (special filler)
  • 3. Support saddle
  • 4. String (load-bearing cable)
  • 5. Support

Suspension bridge:

Load-bearing cable


Support saddle

Stiffening beam


15 m

15 m

  • 1. Stiffening beam
  • 2. Suspension
  • 3. Support saddle
  • 4. Load-bearing cable
  • 5. Support

The horizontal load in the overpass (about a thousand tons, which, for example, is two orders of magnitude less than in hanging bridges) is taken by anchoring structures installed at a distance of up to 10 kilometers from each other. Supporting towers take up little vertical load, which eliminates the need to make them so massive and install them as often as in conventional elevated motor and rail roads or monorail systems. The unsupported spans can be up to 3 km long. This is important when crossing water barriers, passing over gorges, areas with residential or industrial buildings, lines of energy and transport communications, etc.

You can learn more about the key elements of the complex in the following sections: