Pity I did not see this before, but if you return then Weybourne station is a decent position. or go to kelling heath holiday camp where you can park up and walk down to the railway line which passes through on its way to Holt, The line runs too and froe via Sherringham to Holt, check out google earth.
MNR also do some runs with steam and diesel. I have some decent quiet photography locations along the line.