They should've built the one in Rumney when they rebuilt/raised the bridge over the railway line. Missed opportunity there. There should be another one by the shops on Newport Rd/junction with Rover way. When you're on that line, there appears to be plenty of places they could have small stations for local services, but that side of the city always seems to get overlooked in regards to rail.
About time they built a new exit out of Llanrumney as well, ideally onto the A48.