Yr holl drenau sy'n rhedeg ar wasanaethau lein y Cymoedd ac sy'n pasio trwy Stryd y Frenhines Caerdydd yn cael eu gyrru gan drydan.Dyblu'r gwasanaethau i gefnogi'r cynllun Swyddi Gwell yn Nes Adref gyda phedwar gwasanaeth yr awr o Dreherbert, Aberdâr Merthyr o 2022 ac o Rymni o 2023, gyda 2 wasanaeth yr awr ar yr holl leiniau hyn o 2024 ar y Sul.Dyblu'r gwasanaethau ar lein Glynebwy o 2021 ac ar lein Bro Morgannwg o 2023.45 y cant yn fwy o seddi ar y trenau i Gaerdydd ar adeg brysur y bore,Fflyd o Gerbydau Metro modern a hygyrch fydd yn gallu mynd ar y stryd i wasanaethu leiniau Cwm Taf a'r Ddinas a threnau newydd tri-modd ar gyfer leiniau Rhymni, Coryton, Penarth, y Barri a Bro Morgannwg, er mwyn caniatáu gwasanaethau trwodd i'r leiniau di-drydan i'r de ac i'r gorllewin o orsaf Caerdydd Canolog.Caiff gorsafoedd newydd eu hadeiladu yn Nghaerdydd yn Sgwâr Loudon, Heol y Crwys, Gabalfa a'r Flourish.
100% electric traction on all trains operating on valleys line services which pass through Cardiff Queen Street.A doubling of services to support Better Jobs Closer to Home with four services an hour from Treherbert, Aberdare and Merthyr from 2022 and Rhymney from 2023, with the Sunday service providing 2 services per hour on all of these lines from 2024.A doubling of services on the Ebbw Vale from 2021 and on the Vale of Glamorgan line from 202345 per cent more seats into Cardiff in the AM peakA fleet of modern and highly accessible on street capable Metro Vehicles to serve the Taff Vale and City lines and new, innovative tri-mode trains for the Rhymney, Coryton, Penarth, Barry and Vale of Glamorgan lines   to allow for through services to the non electrified lines south and west of Cardiff Central.New stations will be built in Cardiff at Loudoun Square, Crwys Road, Gabalfa and at the Flourish.