IIRC the latest GW RUS has said that there's not a +ve BCR, which I believe is short sighted and to say the least naive, as by increasing the capacity on the line would actively encourage people to leave their cars behind & also make Newquay easier to get to & from, not only for people who live in the locale, but for those further afield.
It's a shame, because I like Newquay, it has many happy memories for me, but getting to it by road is a nightmare, I'd much prefer to use the train, but the service is so poor, it makes it impractical.