Transport for Wales is inviting members of the public to share their views as part of a consultation which runs to 14 January.
Transport for Wales is looking for feedback on the designs of potential stations at Cardiff East, Newport West, Somerton, Llanwern and Magor and Undy, including the types of facilities that people would like to see at each station. The consultation is available on: Haveyoursay.tfw.wales/sew-new-stations-and-services
Members of the public are also being asked for their views on new train services between Cardiff, Bristol and Cheltenham Spa that could provide the new stations with up to four trains per hour and increase frequencies at existing local stations on the route.
If funded, the proposals will create new opportunities for direct local and cross-border travel on both sides of the Severn by public transport.
The proposals are key recommendations of the South East Wales Transport Commission, delivered as part of the South Wales Mainline Programme, which aims to greatly improve how people access and travel on the railway.