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Giant railway machine goes almost unnoticed by the public, but plays a decisive role in rail infrastructure: the maintenance of the track that supports heavy trains, logistics corridors, and cargo operations in strategic regions of the country, with technology aimed at complex sections.
Rumo Logística received the Unimat 09-8×4/4S, a railway machine weighing 170 tons and 45 meters in length manufactured by Plasser & Theurer, in Austria, to operate in the maintenance and construction of railways in Brazil.
According to Plasser do Brasil, the equipment is the first of this model in operation in Latin America and was incorporated to enhance precision in continuous line sections and in Switches, the AMVs.
After arriving at the end of January at the Port of Santos, the machine proceeded to Hortolândia, in the interior of São Paulo, where it underwent the commissioning stage conducted by Plasser do Brasil before field deployment.
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In the initial operation, the equipment will serve the São Paulo network in the corridor between Rondonópolis, in Mato Grosso, and the Port of Santos, in addition to the Mato Grosso Railway, planned to connect Rondonópolis to Lucas do Rio Verde over 743 kilometers.
Railway maintenance on cargo lines
Designed for heavy interventions, the Unimat 09-8×4/4S combines leveling, alignment, and compaction in an integrated track maintenance process, acting on the main elements that support railway circulation.
In practice, the equipment repositions rails and sleepers, reorganizes the crushed stone ballast, and restores stability to the assembly that receives the repeated loads generated by the passage of heavy compositions.
In cargo railways, this maintenance becomes crucial because the constant pressure on rails, sleepers, and ballast can alter the track geometry over time and require periodic corrections.
When alignment and leveling deviate from defined parameters, the operation needs interventions capable of preserving safety, availability, and performance in the corridors used for the rail transport of large volumes.
The tamping work plays a central role in this process, as the machine’s tools penetrate the ballast, compact the stone layer at specific points, and help keep the sleepers in the correct position.
Technology for Track Switching Devices
The standout feature of the model appears mainly in the Track Switching Devices, structures known as TSDs that allow the transfer of a train from one track to another within the railway network.
At these points, the presence of needles, crossings, movable parts, and more complex geometries than a straight line requires maintenance with greater precision and equipment capable of working in varied configurations.
According to Plasser do Brasil, the 8×4 tamping unit has eight independent banks, capable of tamping two sleepers simultaneously or switching to single sleeper mode when the track requires this adjustment.
This flexibility allows servicing sections with hollow sleepers, double sleepers, and complex railway crossings, without limiting the machine’s operation to simpler geometry segments.
Plasser & Theurer describes the 8×4 unit as a universal tamping solution, formed by independent segments and tiltable tools for work on continuous tracks and in TSD areas.
With continuous action, the model can also switch between tamping two sleepers and one sleeper, according to the characteristics found in the section under maintenance.
Less Blockage Time on the Railway
Each intervention on a freight railway needs to be fitted into operational windows that affect train circulation, field team work, and the logistical scheduling of the corridor.
For this reason, machines capable of executing more stages in a single pass help reduce separate operations and allow the service to be concentrated in a more controlled period of track blockage.
The Unimat 09/4S series uses continuous tamping technology, a feature that reduces line occupation time and allows entry and exit ramps to be executed in a single pass, according to Plasser do Brasil.
With this solution, the correction does not end abruptly in the worked section, as the transition between the adjusted area and the rest of the track also needs to be controlled.
Another relevant feature is the dynamic stabilizer, a system responsible for promoting controlled ballast settlement after tamping and for consolidating the track after geometric correction.
This step helps reduce operational restrictions right after maintenance, especially in corridors where line availability directly impacts the flow of cargo.
45-Meter Railway Machine
The size of the machine helps explain the complexity of the operation, as the 45 meters in length concentrate cabins, hydraulic systems, tamping units, measuring mechanisms, and stabilization components.
Besides the mechanical structure, the equipment gathers digital resources used to guide field intervention and monitor work parameters during railway maintenance.
Among the systems mentioned by Plasser do Brasil is the Plasser Intelligent Control, aimed at machine diagnostics and operation, along with compatibility with the international measurement standard EN 13848.
The company also states that the equipment can reach up to 100 km/h in self-propelled movements, a relevant feature for a maintenance machine of this size and technical configuration.
According to Plasser & Theurer, the model’s structure was designed to meet heavy railway superstructures, including heavy haul lines, a category associated with the transport of large cargo volumes.
This type of application is connected to the intended use in corridors linked to railway flow to Santos and the expansion of the network in Mato Grosso, two significant axes for national logistics.
Strategic Railway Corridors
Even though it does not transport cargo, ore, or passengers, the Unimat operates on the physical base that allows railway operation and keeps the track in suitable conditions to receive heavy compositions.
Without geometry maintenance, rails and sleepers can lose stability, compromising the railway’s ability to support regular traffic in corridors used for transporting large volumes.
The arrival of the equipment in Brazil shows that railway modernization does not depend solely on locomotives, wagons, terminals, and new sections under construction or expansion.
Part of this advancement occurs in maintenance machines that work away from public attention but help preserve the availability of strategic corridors and reduce the impact of interventions on operation.
