As well as rail, bus services are being reviewed with local authorities and industry partners to develop a more effective and integrated public transport network.
Yn ogystal â'r rheilffyrdd, mae gwasanaethau bysiau'n cael eu hadolygu gydag awdurdodau lleol a phartneriaid yn y diwydiant i ddatblygu rhwydwaith trafnidiaeth gyhoeddus fwy effeithiol ac integredig.