I thought the Ribblehead stone came from Ingleton Quarry [*] and Horton was still roaded out as normal - mostly via Settle town centre.
[*]There's a lot of trucks shuttling up and down the Chapel-Le-Dale road.
Having said that, both Ingleton and Horton are currently operated by Heidleberg, so some of it may go out via Ribblehead sidings. I probably need a long lunchbreak trip to investigate!
Operation of the rail sidings should be similar to that to the nearby Arcow quarry.