materials that had to be shipped to central pacific workers included\ncoal and oil.\nsilver and…

materials that had to be shipped to central pacific workers included\ncoal and oil.\nsilver and machinery.\noil and gold.\niron and machinery.

materials that had to be shipped to central pacific workers included\ncoal and oil.\nsilver and machinery.\noil and gold.\niron and machinery.

Answer

Brief Explanations:

During the construction of the Central - Pacific Railroad, iron for rails and machinery for construction were essential materials shipped to the workers. Coal and oil were not the main ones for this context, and silver and gold were not primary construction - related shipped items.

Answer:

iron and machinery.