The physical junction at Upwey Junction was immediately south of the station; the branch line descended steeply from the junction, while the main line continued to climb. The line was falling at 1 in 44 and unfitted goods trains required to stop to pin down brakes. Upwey station was at 0m 35c, and gradients were more moderate from there passing Friar Waddon Milk Platform at 2m 00c and climbing at 1 in 228 and then a short length of 1 in 60 to Coryates Halt, 2m 79c. Continuing then at 1 in 60 rising, the line reached Portesham at 4m 47c. The line then fell with a ruling gradient of 1 in 60 to Abbotsbury at 6m 3c.