A spline of 3 parallel double-deck hardwood stringers in 20ft sections with a wooden plank walkway to one side. Each stringer has a 1ft square cross section. A single unballasted standard-gauge track can be added on top of the stringers.
For trestles to support the deck use the series 'NSWGR wooden trestle bent (pier)...' that commences with <kuid:368725:20331>.