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I use this line when I go to visit my Mother who lives near Tywyn & have been doing so for the last six years & have not seen any freight in all that time
I think the main problem is it being single track with few passing places
Passing places were taken out when the line was rationalised some years ago.
Passing placaces could be replaced for a more intence rail service this would apply to the whole Cambrian line
But I suppose a freight service could run over night when there are no passenger trains(one in each direction every two hours)