Financial Appraisal is calculated by comparing the total costs of the rail based solution with the total costs which would be incurred if the traffic used road transport.
Cyfrifir Arfarniad Ariannol drwy gymharu cyfanswm costau cludo ar y rheilffyrdd â chyfanswm y costau yr eid iddynt pe bai'r traffig yn defnyddio’r ffyrdd.