Zone used for simulation to calculate U mean useful
Simulations shall be carried out on a zone which represents a significant part of a line or a part of the network, such as the relevant feeding section(s) in the network for the object to be designed and assessed.
Time period used for simulation to calculate U mean useful
For simulation of U mean useful (train) and U mean useful (zone) only trains that are part of the simulation during a relevant time, such as the time needed to go through a complete feeding section, have to be considered.