Narrow concept: This implies or refers to toll or tariff collection from the users, or it implies the existence of a relevant interface with final users (operating a rail system in that sense would mean handling the service of transportation, that is, being in charge of driving the trains, even in the case that the private partner is not in charge of collecting the fee to the passengers).
Broad concept: Other obligations and responsibilities that allow the infrastructure to be available to use. These activities are not necessarily only maintenance activities in the strict sense of the word. For example, for a road, the clearance of accidents or the service of removing snow (winter viability service).


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