Rail lubrication through lubrication holes for trams and metros
The wheel sensor in the track is counting the wheels and is connected to the integrated controller of the pump. Once the desired number of wheels got counted, the pump starts to run and feeds the dividers in the track with lubricant.
Each metering device meters the incoming lubricant and supplies a precise small amount of lubricant to each lubrication channel.
In case of tracks embedded in the street, the metering devices are protected by steel boxes.