This is a VERY busy main road - take all precautions. I suggest that you use the lay-bys which both give access to good views of the line, especially the one nearest Bolton Abbey station. The view from the Bolton Abbey lay-by is of the uphill section out of Bolton Abbey and can be recommended, as the locos can work quite hard. Be very careful on Holywell bridge as there is no footpath alongside the road. A glimpse of the line can be had through a gateway opposite the turning for Embsay, down the back lane. This will show the locos having just started from Stoneacre Loop, climbing towards Embsay.
Back Lane - between Embsay and the A59
This is a very narrow lane in places with restricted visibility along the road. DO NOT TAKE YOUR CAR WITH YOU TO TAKE PHOTOS - WALK as there is no parking along the road. This offers good views of the line between Holywell Halt and the approach to Embsay station.
Prior's Lane - between the A59 and A65 through Draughton
Another minor road - again, no cars here. This offers views of the line up towards Stoneacre Loop from the bridge, as well as down towards Bolton Abbey. The bridge DOES have a wide verge across it, so is ideal.
The footpath between the A59 at Holywell Halt and the back lane crosses the railway at Skibeden footbridge and givessome very worthwhile views of the line and the surrounding landscape.
The footpath that runs beside Stoneacre Loop also provides a good view of the line, with engines starting from the loop when two train running is in operation.