The X63 used to have boarding/alighting restrictions at each end meaning local passengers were not carried, you couldn't get on after Low Moor into Bradford or after Fartown into Huddersfield but you could still get off at all stops and get on in the opposite directions.
Now since it replaced the X6, the X63 it has become non stop in those areas so for example if you live on Manchester Road in Bradford you can no longer go to Huddersfield.