The route of the branch commenced on the north side of the level crossing in Grimsargh and curved sharply westward on a falling gradient into the deep cutting and on to the embankment before crossing Brabiner Lane. The line then climbed on a gradient of 1:120 to the hospital grounds passing over a small accommodation bridge before entering Whittingham station. A small coal storage area and engine shed existed beyond the hospital station and the 1921 extension continued for across the hospital lawns, beside the fish pond, to the boiler house.