today 143
today 143
The universal tamping machine has been specially adapted to Humetro's needs: it is the first version of the new Compact series on the Korean market and replaces a Unimat Junior, which had been in use since 1998. To avoid disruptions to metro operations, maintenance is carried out within a tight time frame between the end of service at 1 AM and the start of service at 5 AM, which requires highly reliable and powerful machines.
From main line to metro – the Compact series operates globally
The CompactFlex 2x4 is part of a new generation of compact tamping machines based on a modular concept that meets the highest standards for safety and ergonomics. The series offers machines for plain-line tamping as well as universal tamping machines. Numerous options allow operating companies to customize their machine, for example by choosing from eight different tamping unit types to optimally adapt to the prevailing conditions. With its compact design and low axle loads, it can be used on practically every line category, when structure gauges are narrow, and in small radii. This makes the Compact series suitable for many tasks, including special requirements for metros.
Machines produced in series with customized solutions
The CompactFlex must fulfil numerous special requirements: for example, it must be transportable. It was important for Humetro to be able to transport the tamping machine once a year by lorry to a section of track not connected to the rail network without having to forgo a completely covered machine. To comply with the permissible transport height of 3.6 metres, the roof construction had to be specially adapted. For example, mounted structures were either integrated or fitted underneath without compromising the ergonomics of the cabs. Despite the height requirement, sun protection roofs were incorporated into the design, preventing the cab from heating up.
All tools integrated for one-person operation
The central control element of the tamping machine, the Automatic Guiding Computer (SmartALC), calculates the lifting and lining values to correct the track geometry. It is operated from the front cab as standard. An additional control and operating element has been integrated for Humetro so that one person can carry out all maintenance tasks from the work cab. High-resolution cameras make it easier to configure the lifting and lining unit, and a positioning laser marks the centre of the sleeper.
Cameras for close-range safety
High-resolution night vision cameras at the front, rear, and sides monitor the machine’s immediate vicinity and provide information about people in the danger zone. The closed-circuit television (CCTV) system provided by the customer continuously records the images from the cameras to improve traceability in the event of operating errors or accidents.
Re-railing device
Thanks to the system with permanently integrated hydraulic lifting jacks, the machine can be moved across and placed next to or back on the track in order to clear sections as quickly as possible if necessary.
Electrification
The machine is equipped with a battery pack for powering the electrical air conditioning systems and consumers. It can be charged using the engine or a remote power supply in the depot.
Service and support from local partners
Together with our local partner Plasser FarEast, we carry out the demanding approval process and provide Humetro with commissioning, training, and maintenance service 24/7. This ensures high availability and reliable operation.
Carrier of technology for the new assistance system
TampingControl – Force Automation determines and adjusts the optimum squeezing force in real time based on the ballast conditions – this unburdens operators and increases process reliability. All relevant parameters can be documented for improved verification. The product will be available for all current variants of the Plasser CompactFlex ordered as of 2026.
Tamping unit with complete variability
The built-in 2x4 tamping unit is characterized by high flexibility. All eight tines are tiltable, and the two tamping unit segments can be lowered independently of each other. Together with the variable opening width of the squeezing cylinders, this makes it possible to react appropriately to obstacles and tamp every sleeper with precision – even in the most difficult conditions. In addition, the integrated frequency control reduces wear, saves fuel, and reduces noise.
As of 2026 TSO, the French construction company, will be in charge of maintaining the Paris metro network on behalf of RATP Group, the operating organization. In order to make this work more environmentally friendly in future, TSO has ordered two battery-powered tamping machines from the E³ series. The two Plasser MetroFlex E³ machines are characterized by an innovative drive concept with batteries as the energy source.
As passenger services are usually from around 5:30 AM until 1:00 AM, the time windows available for maintenance are short. A battery-powered drive concept can really come into its own here. The ratio of energy required (battery capacity) and available charging time means that the machine can be charged during the day between operations. One of several options with the Plasser MetroFlex E³: power can be routed directly from the third rail via the power converter to the battery pack.
E³ fulfils several needs at once on urban tracks: making workplaces more attractive, minimizing health risks, and not depriving lineside residents of sleep. In tunnels and densely populated areas, emissions from construction machinery have an increased impact, as sound is reflected and ventilation is limited. The working environment specific to metro lines poses additional challenges for the machine concept. A narrow structure gauge and small curve radii require a very compact design in which the new drive concept including battery technology must be accommodated.
