Terrain factors caused the line to be composed of dual single-bore tunnels and have two significant twin track concrete viaduct structures at Woolloomooloo and Rushcutters Bay. The route from Bondi Junction to Kingsford was selected, primarily because of the ease of tunneling through sandstone along the high topological ridgeline that runs from the existing terminus at the Junction, via Waverley, northern Randwick, Randwick Junction and to the eastern side of the University of NSW. The intended terminus at Kingsford, where the terrain drops closer to sea level, may have been an above ground station with potential for stabling yards on then government-owned land near the suburb of Daceyville.