Modelling one side of a hill as a rock face can enable the landscape to be elevated further within a limited amount of space. A rock face can be very steep or almost vertical and can be built very close to a railway line. When building some railway lines engineers often blasted a path through rocky terrain using explosives to enable a more direct route to a destination.
Model scenery created using this method requires only one sloping side and can therefore often be used to gain enough height to allow trains to be hidden by areas of the landscape.
Trees and bushes added along the top of the elevated landscape during the final stages of construction could also add extra height and help to create a more realistic skyline.
Rounford Halt is one of my N gauge scenic model railway layouts. To see more model railway layout baseboards I have designed and built visit my website www.brianford.co.uk.