I have never suggested that the full length Wensleydale Railway should provide a public transport service from Garsdale to Northallerton. The best solution would be the reinstatement of a single track branch line from Garsdale to Hawes served by the extension of Manchester - Clithetoe services via Hellifield, with a parallel cycleway along the route if possible. From Hawes station, there could be bus connections further into the dales and perhaps the tourist attraction of the heritage Wensleydale Railway could also be extended to Hawes, but this is not a necessity.The WR doesn't really provide a public transport service and isn't ever likely to.
If that requirement needs to be fulfilled, a bus service is the way to do it.