This European Standard establishes a common methodology (general rules) for the calculation and declaration of energy consumption and greenhouse gas (GHG) emissions related to any transport service. It applies for passenger and freight transport services, provided by, for example, LPT and railway companies. The standard contains: definitions, general principles, calculation methods and examples, as well as declaration specifications. It is based on a pragmatic and scientifically acceptable approach which allows application for a wide group of users. Potential users of this standard are any person or organisation who needs to refer to a standardized methodology when communicating the results of the quantification of energy consumption and GHG emissions related to a transport service, especially: - transport service operators (freight or passengers carriers), - transport service organisers (carriers subcontracting transport operations, freight forwarders and travel agencies), - transport service users (shippers and passengers). This European Standard has been prepared by CEN/TC 320/WG 10 with the collaboration of German experts. At DIN, Working Committee NA 159-01-13 AA "Energieverbrauch und Treibhausgasemissionen im Zusammenhang mit Transportdienstleistungen (Personen- und Güterverkehr)" ("Energy consumption and GHG emissions in relation to transport services") at the Services Standards Committee (NADL) is responsible.