While station entries and exits are estimated based on ticket sales at train stations, the Office for Rail and Road (ORR) also publish estimates of passenger journeys by Train Operating Company (TOC).
Mae data ar gofrestriadau cerbydau modur yn cael eu casglu gan yr Asiantaeth Trwyddedu Gyrwyr a Cherbydau (DVLA) a'u cyhoeddi gan yr Adran Drafnidiaeth.