With Cardiff at the moment there is a three-way argument between the trolley, rail and tram lobbyists.
The tram/light rail supporters want to convert the city line to light rail and extend the bay branch as a tram extension and have talked about running a line around the castle and down queen street.
The rail lobby of course wants electrification as a way to improve service and have a "valleys metro" with St Fagans or Ely re-opening due to better braking/acceleration of EMU operation.
and the trolley supporters who want to simply electrify the busiest bus routes and replace the diesel buses with electric. This is being promoted as the cheap option compared to the previous two.
I myself would love to see trolleybuses return to the streets of Cardiff as in my view they are the better option than trams, and the connection between Cardiff and the rest of other large/medium cities is of course all USED to have a trolley system
I wouldn mind seing some articulated trolly buses back in Cardiff perhaps say on the baycar route and the City Centre - Ely routes where Cardiff bus operate their bendys on (Which no doubt are brilliant and lovely to travel on).
We have seen Cardif city council want to run a BRT service down to St Fagans something which I am not sure teh roads could cope with (hard enough with a dart at times) and I would vote no to having a railway station at St Fagans trains are bad enough during the peaks as it is not sure about Ely however perhaps a station could be built on the cityline?
I would agree with the Cardiff Queen St - Cardiff bay line being converted to light rail and extended to serve other parts of Cardiff Bay