A real gem locally is the very under publicised Bristol Harbour Railway, which runs from the SS Great Britain on Bristol's harbourside to the Create Centre. In 2011 it should re-extend to the newly refurbished Industrial Museum. This line has previously hosted a Parry People Mover. It's not open every weekend but the 2010 timetable is here.
This line could also become a very valuable transport link in the future. It could re-extend southwards to join the Portishead line - it's less than half a mile to rejoin the network over a bridge that saw trains (and heavy, steam-hauled ones at that!) as recently as 1996. It could also extend into the centre of Bristol tramway style, connecting with the new Bristol tramway system. This would then give a surely soon-to-be-reopened Portishead branch TWO traffic flows, one to Bristol Temple Meads for longer-distance travellers and freight and one to the city centre via the new developments on the Harbourside south, serving commuter flows. Tram-trains, Parry People Movers, conventional electric multiple units and, of course, steam hauled heritage trains could all operate the routes from Portishead to Bristol, complementing the current heavy freight use of this very important route.