UnitedKingdom Annexe 3 - Note e

the provision or operation of networks2 providing a service to the public in the field of transport by urban railway, automated systems, tramway, trolley bus, bus or cable;

Referenced Notes:

2 As regards transport services, a network shall be considered to exist where the service is provided under operating conditions laid down by a competent authority of the United Kingdom such as conditions on the routes to be served, the capacity to be made available or the frequency of the service.