This transport-related list is incomplete; you can help by adding missing items. (October 2021)

Passenger railroads

• Skyline (first segment opened on June 30, 2023)

Heritage and Scenic Railroads

• Hawaiian Railway Society
• Kauai Plantation Railway
• Lahaina, Kaanapali and Pacific Railroad

Defunct railroads

• Ahukini Terminal and Railway Company
• Hawaii Railway
• Hawaii Consolidated Railway
• Hawaiian Railroad
• Hilo Railroad
• Kahului Railroad
• Kauai Railway
• Koolau Railway
• Oahu Railway and Land Company
• West Hawaii Railway

Electric

• Honolulu Rapid Transit and Land Company

Industrial Rail Operations

Island of Hawaii

• Hamakua Mill Company
• Kukaiau Plantation Company
• Hawaii Agricultural Company
• Honokaa Sugar Company
• Pacific Sugar Mill Company
• Hutchinson Sugar Plantation Company
• Kaiwiki Sugar Company, Ltd
• Kohala Sugar Company
• Kona Sugar Company
• Olaa Sugar Company
• Puna Sugar Company
• Hawaiian Mahogany Lumber Company
• Laupahohoe Sugar Company
• Paauhau Sugar Plantation Company
• Puako Plantation
• Waiakea Mill Company

Island of Kauai

• Grove Farm Company
• Hawaiian Sugar Company
• Kekaha Sugar Company
• Kilauea Sugar Plantation Company
• Koloa Sugar Company
• The Lihue Plantation Company
• Hanamauku Sugar Plantation
• Ahukini Terminal and Railway Company (absorbed by the Lihue Plantation)
• McBryde Sugar Company
• Eleele Plantation
• Kauai Railway Company ( McBryde Sugar Company sponsored)
• Waimea Sugar Mill Company

Island of Lanai

• Maunalei Sugar Company

Island of Maui

• Hawaiian Commercial & Sugar Company
• Kihei Plantation Company
• Maui Agricultural Company
• Paia Plantation
• Kaeleku Sugar Company
• Hana Plantation Company
• Kipahulu Sugar Company
• Kaeleku Sugar Company
• Pioneer Mill Company
• Olowalu Sugar Company
• Wailuku Sugar Company

Island of Molokai

• American Sugar Company

Island of Oahu

• Ewa Plantation Company
• Heeia Agricultural Company
• Kahuku Plantation Company
• Koolau Railway Company (bought out by Kahuku Plantation Company)
• Hibiscus & Heliconia Short Line Railroad
• Oahu Sugar Company
• Honolulu Plantation Company
• Waiahole Water Company
• Waialua Agricultural Company
• Waianae Sugar Company
• Waimanalo Sugar Company

References

• Hilton, George W. (1990). American Narrow Gauge Railroads. Stanford, California: Stanford University Press. ISBN  0-8047-2369-9.
• John B. Hungerford, Hawaiian Railroads, 1963. Reseda, California: Hungerford Press
• Jesse C. Conde and Gerald M. Best, Sugar Trains, Narrow Gauge Rails of Hawaii, 1973. Fenton, California: Glenwood Publishers