Vollert’s VLEX road-rail robot redefines light shunting

German engineering company Vollert is reshaping light shunting operations with its VLEX road-rail robot, a compact, battery-electric vehicle designed to move railcars efficiently between track and yard in increasingly constrained industrial environments.

A compact robot built for road and rail

The VLEX concept originated as a response to growing demand for flexible shunting on industrial sidings, secondary railway systems and port terminals where traditional locomotives are often too large, noisy or costly to operate. Publicly available information shows that the first VLEX units were designed for shunting loads of around 300 tons, aimed at light duties inside plants and depots.

The current generation has evolved significantly. Technical brochures and recent company material indicate that the family now includes the VLEX 20 and the more powerful VLEX 40, with tractive capabilities scaled for loads up to about 600 tons, depending on configuration and operating conditions. Both models are compact enough to maneuver in tight yards, but the higher-rated variant adds only about half a meter in length while roughly doubling towing capacity.

Unlike conventional shunting locomotives that remain rail-bound, the VLEX is engineered as a true road-rail vehicle. Operators can guide it off the tracks and onto paved or suitable compacted surfaces, using this flexibility to bypass congested track sections, bridge short gaps in rail infrastructure or position the robot directly next to loading areas. This two-way capability is central to its appeal for sites where rail access threads through busy production or storage zones.

Design details highlighted in product literature, including articulated steering and individually driven wheel hub motors, support extremely tight turning radii and allow the vehicle to rotate in place when space is limited. These characteristics are particularly attractive for depots and industrial plants that have retrofitted rail access into existing layouts rather than purpose-building large yards.

Battery-electric drive targets emissions and noise

Vollert frames the VLEX as a fully electric shunting solution. The robot is powered by on-board batteries and charges via standard industrial power connections, avoiding the emissions and noise associated with diesel shunters. Reports on recent deployments stress that this configuration allows the vehicle to operate inside enclosed halls, tunnels and workshops where internal combustion engines would be problematic.

The company’s technical documentation emphasizes the use of solid rubber tires and substantial dead weight to maximize traction, ensuring that power from the wheel hub motors transfers effectively to both rail and road surfaces. Hydraulic track-guiding units are lowered for rail operation and can be locked to provide the lateral stability required at higher tractive forces.

Recent industry coverage notes that the shift toward battery-electric and hybrid handling equipment is accelerating around rail-linked logistics hubs, particularly in Europe, as operators look to cut local pollution and comply with stricter environmental rules. In this context, the VLEX is positioned as part of a broader move away from small diesel locomotives for short-distance shunting inside plants and logistics terminals.

Beyond emissions, the electric drive also reduces vibration and noise levels, an important factor for metro depots, maintenance workshops and urban industrial zones. Lower acoustic impact helps operators meet occupational limits and minimize disturbance for nearby residential areas, which increasingly surround long-established railway facilities.

From tram depots to steel and quarry operations

Since its introduction, the VLEX platform has been applied across a wide spectrum of industries. Reference projects cited in trade publications describe deployments in tram and metro depots, where the vehicle moves multiple-unit sets between storage sidings, inspection pits and workshop tracks during maintenance or expansion projects.

In heavy industry, the higher-capacity VLEX 40 has been adopted for tasks such as positioning scrap wagons at steelworks and moving loaded freight wagons near furnaces or rolling mills. Here, the robot’s ability to leave the rails and operate as a road vehicle allows material flows to be reorganized without building additional track, a key advantage in brownfield plants where space is tightly constrained.

Examples from the building materials sector show VLEX robots serving quarries and precast concrete plants, where they couple to groups of freight cars for loading stone, aggregates or large concrete elements. Industry reports indicate that in some facilities, a single operator can use radio control to manage both the loading machinery and the shunting robot, reducing personnel requirements while keeping movements under close observation.

Rail freight maintenance sites, including alpine locations with harsh winter conditions, have also turned to the VLEX concept. Accounts from these projects describe the robot moving locomotives and wagons that are temporarily out of service or disconnected from overhead wires, often across mixed surfaces of ballast, concrete and asphalt, where consistent traction and compact dimensions are crucial.

Automation-ready features and remote operation

Although the VLEX is not marketed as a fully autonomous train, its design incorporates several features that align with broader automation trends in rail logistics. The vehicle is operated via radio remote control, allowing staff to walk alongside or position themselves for optimal visibility while shunting. This approach eliminates the need for a conventional cab, keeping the platform small and improving sight lines around the train.

Technical descriptions point to the use of articulated steering driven through differential wheel speeds rather than traditional steering cylinders. This simplifies mechanical systems and opens paths for more sophisticated control algorithms that could, in future, integrate more deeply with yard management software and sensor-based safety systems.

Some reference installations have equipped VLEX units with camera systems that feed live images to the operator’s handheld controls, a concept similar to automotive rear-view camera displays. Public documentation suggests that these visual aids are especially valuable in busy industrial yards, where workers, road vehicles and other mobile equipment interact with the rail infrastructure.

As rail operators and industrial companies investigate progressive automation of shunting moves, road-rail robots like the VLEX provide a modular stepping stone. They can be integrated into semi-automated workflows, where remote-controlled robots perform repetitive movements under human supervision, potentially paving the way for higher levels of autonomy as standards and regulations mature.

Positioning within the rail shunting market

The VLEX road-rail robot enters a competitive space that includes traditional shunting locomotives, cable-based systems and other specialized rail-rail and road-rail vehicles. Market observers note that its niche lies in light to medium-duty operations, particularly where infrastructure constraints and environmental requirements make conventional solutions less attractive.

Compared with larger locomotives, the VLEX requires less track infrastructure and can be transported relatively easily between sites, which is advantageous for construction projects, temporary depots or operators seeking short-term rental arrangements. At the same time, the robot’s towing capacity, which recent marketing material places in the several-hundred-ton range, positions it above many smaller yard tractors or towing units intended only for single wagons.

In Europe, continued investment in rail-connected logistics and pressure to decarbonize last-mile freight operations are likely to sustain interest in compact, electric shunting solutions. Analysts following the sector highlight the potential for road-rail robots to extend rail’s reach into industrial estates, ports and construction zones where space limits have historically favored trucks.

As more reference projects emerge across tramways, steel plants, quarries and intermodal hubs, the VLEX brand is becoming a visible case study in how hybrid road-rail technology and battery-electric drive can reshape traditional yard operations. For operators, the combination of maneuverability, emissions reduction and automation-ready control systems offers a pathway to modernize shunting without wholesale reconstruction of existing infrastructure.