Track Superstructure

Track Superstructure


the part of a railroad track that consists of the rails, their joints, anticreepers, and supports (ties, slabs, and so on), and the ballast layer.

The track superstructure receives the load stress from the rolling stock and transmits it to the substructure (the earth bed or man-made structures such as bridges and tunnels). Track superstructures also include switches and dead crossings. The ties, which are made of wood, reinforced concrete, and, less frequently, of metal, ensure the fixed relative position of the rails; they receive the pressure from the rails and transmit it to the ballast layer. On certain sections, ties have begun to be replaced by solid-block, reinforced-concrete footings in the form of slabs or bed plates. Anticreepers in the form of metal clamps keep the rails from slipping along the track during the passage of trains.

The track superstructure of subways, streetcar lines, and bridges is distinguished by certain characteristics: in subway tunnels it usually does not have a ballast layer, and the ties are laid on the concrete foundation of the tunnel. Streetcar track superstructure is influenced by the need for convenient crossing of the streetcar tracks by automobiles and for reliable bonding with the road pavement. In connection with these factors, streetcar lines on streets that have heavy automobile traffic customarily use grooved rails mounted on a solid reinforced-concrete foundation with ties set into it or on a foundation of concrete slabs with a layer of ballast between the slabs and the ties. In many cases, track superstructure on bridges is laid without a ballast layer. In such cases the bridge beams are used instead of ties.

The type of track superstructure (the kind of material and the dimensions of the components) depends upon the freight-traffic density. For railroad trunk lines in the USSR the following three types are utilized: I—extra-heavy, for an annual freight-traffic density exceeding 50 million ton-km per km and rails weighing 75 kg per linear m; II— heavy, for a freight-traffic density of 25-50 million ton-km and rails weighing 65 kg; and III—normal, for a freight-traffic density of up to 25 million ton-km and rails weighing 50 kg.

As of 1970, work was being carried out in using solid reinforced-concrete footings under the rails.


Shakhuniants, G. M. Zheleznodorozhnyi put’. Moscow, 1961.
Chernyshev, M. A. Ustroistvo, soderzhanie i remont puti, 2nd ed. Moscow, 1963.


References in periodicals archive ?
Delivery of track superstructure material for tram systems of DVB AG PG 1 - Thresholds PG 1.
4 500 m 2 cycle track superstructure in asphalt construction: Approx.
The contractor~~s duties include construction, Procurement and construction during the construction consultant, Risk management, Track superstructure and curing repair specialist and site inspector consultant task lists, As well as duties of the security coordinator.
Services in order to standardize the type of track, replacement of defective itself, JIL sites chopped material defects and spent eliminating disruptions unconstructive and bringing in technical parameters of the track superstructure of railway line 500 thread I + II km 140 + 000-152 + 000 Cadet-range movement and line Rm Sarat CF 500 first line km 105 + 720-108 + 200 every movement Sahateni - Ulmeni, as required by the specifications and antemasuratori.
Tenders are invited for Road bridge Diesdorfer Graseweg over the railway tracks of the DB Netz AG Construction 1: Maintenance Walking and bicycle track superstructure, concrete restraint South axle 20
Track operations include removal, transportation, disposal of the supply and installation of all the material of the track superstructure Renovation of the foundation and execution of the waterproof layer under the ferrata road.
Contract notice: E-0474-16-o-eu new railway bridge kattwyk - ve05a track superstructure area oiltanking, 1st section.
Track superstructure, ballasted and slab tracks (lifting part NBK) .
Tasks project supervisor ground and foundation construction, excavation works, Post Larin underpass widening of the street and the related arrangements, the track superstructure and electrification and strong current work, the installation of safety switches external device works, and the main contractor.
Track superstructure, electrification, safety equipment, and a strong current jobs do not fall within the contract.
In connection with the bridge repair the railway infrastructure facilities, the catenary and the track superstructure are completely renewed.