The owning groups might, the rail companies certainly do not.That said, those rail firms do probably own many of the bus companies.
The Cleveland Coast and Whitby Day Ranger allows you to travel on a circular route between Middlesborugh and Whitby using Northern trains and Arriva North East buses X4 and X93, the bus connection being along the coast between Saltburn and Whitby.
Not sure what relevance this has to an All Line Rover.
Just to illustrate that there are rovers that can be used on bus services so worth checking the "small print". Apologies for not making it very clear in my orginal post.Not sure what relevance this has to an All Line Rover.