Catenary overhead wires at a temporary grade crossing would probably not be high enough for the cane trucks to cross safely, and they would also demand sectioning. It can be done. The tracks could be of the all-welded design, as the thermal coefficient is favorable here in Hawaii. The wire could come from recycled steel-belted tires. Again, the aggregate for concrete, and ballast comes from local sources.
Adequate ballast is required for proper banking in curve sections and to carry the trains.
Ballast from the source would be transported forward by rail to the advancing construction side. No highway would be used so as to help reduce traffic congestion during construction. By rail-fed, satellite gravel dumps could be established, allowing us to set up remote concrete mixing plants, again reducing road traffic. The additional benefit is a better concrete quality, due to the fact of the now shorter delivery distance for the trucks. The construction would start at the nearest point of the ballast source.