Our heavy-duty Rock Dumper represents more than 30 years of optimisation for large fractions and narrow spaces.

The Rock Dumper is a two-axle underground wagon capable of handling drop-loaded boulders in sizes up to 1500 mm. The wagon is designed for rolling bottom discharge and loading and has a discharge capacity of up to 17,000 tonnes per hour.

This compact solution is dimensioned for the small drifts of underground mines. The Rock Dumper wagons built for the LKAB Kiruna iron ore mine have a width of 2056 mm and a height of 1825 mm. These dimensions can be adjusted according to your needs.

Thanks to the mechanical design, there is a limited amount of waste between wagons without any advanced automation. A train set of up to 25 wagons can operate with a single locomotive.

System philosophy

To lower the tare weight of the wagon, we have used ultra-high-strength steels and a high-performance wear plate system developed by LKAB; WRC System® is designed for easy plate change-outs and allows us to use wear plates as thin as 10 mm, instead of the usual 25 to 30 mm.

The flexibility of the system helps us evaluate and identify precisely the right wear plate for your fraction and mineral. In addition to the benefits provided by WRC System®, the RD is designed for easy changing and servicing of chevrons, bearings and wheels.

The rims and tires in the propulsion unit are standard truck components.

RD in brief

Wagon specifications RD 15/V10 RD 20/V15 RD 25/V20 RD 32/V25
Loading volume 10m3 15m3 20m3 25m3
Max payload 21 tonnes 29 tonnes 37 tonnes 50 tonnes
Tare weight 9 tonnes 11 tonnes 13 tonnes 15 tonnes
Max axle load 15 tonnes 20 tonnes 25 tonnes 32.5 tonnes
Distance between axles 2,500 mm 2,500 mm 3,500 mm 3,500 mm
Gauge 1,000 mm 1,000 mm 1,435 mm 1,435 mm
Unloading capacity 10,000 tonnes/h 14,000 tonnes/h 13,000 tonnes/h 17,000 tonnes/h
Length over couplers 3,500 mm 3,500 mm 5,000 mm 5,000 mm
Height 1,800 mm 2,600 mm 2,300 mm 2,800 mm
Width 2,300 mm 2,300 mm 2,500 mm 2,500 mm
Speed 25 km/h 25 km/h 25 km/h 25 km/h
Coupler height 775 mm 775 mm 880 mm 880 mm
Coupler type Automatic Automatic Automatic Automatic
Brakes Optional Optional Optional Optional
Temperature interval -40 to +60 °C -40 to +60 °C -40 to +60 °C -40 to +60 °C
All wagon types can be customised to fit your logistics preconditions. Such as axle loads, length, volume, loading profile, AAR, TSI, etc.


Kiruna Wagon and our owner company NMV Group have been manufacturing, servicing and adapting Rock Dumpers for the LKAB Kiruna Mine since the 1960s.