The only express service I can think you mean is the semi fast Liverpool-Manchester Airport via Warrington Central service, which already uses them. It was one of the first routes to use 195s from 1st July and should be diagrammed for full 195 operation from 12th August.
Note that 'diagrammed' doesn't mean 'guaranteed', especially on Northern.
Note that 'diagrammed' doesn't mean 'guaranteed', especially on Northern.