Separate names with a comma.
They're already operating six car sets.
I think that's a perfectly valid data point describing a personal response, but I suspect that it's fairly atypical.
a person or thing that comes before another of the same kind; a forerunner.
A precursor of the new Virgin Trains product, I presume.
Low cost is an industry term which refers to an airline’s cost base. It has nothing whatever to do with the fares.