Remote monitoring of operating parameters of a contact line system

The invention relates to the monitoring of operating parameters of a contact line system of a railway line by means of a network comprising radio sensor nodes. The radio sensor nodes are installed at different positions of the contact line system and each comprises a sensor that monitors an operating parameter. For example in the event that a value determined by one of the sensors deviates from a target value, an error telegram is produced by the associated radio sensor node. At least some of the radio sensor nodes form a network, via which the telegram is transmitted to a central unit. The telegram is transmitted via radio along the railway line from one radio sensor node to the next, until it is received in a central unit.