List of Hawaii railroads

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

Island of Hawaii

 * Hamakua Mill Company
 * Kukaiau Plantation Company
 * Hawaiian 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
 * Ookala 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
 * Haiku Sugar 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

 * Beretania Street Railroad
 * Ewa Plantation Company
 * Heeia Agricultural Company
 * Kahuku Plantation Company
 * Koolau Railway Company (bought out by Kahuku Plantation Company)
 * Hibiscus & Heliconia Short Line Railroad
 * Libby, McNeill & Libby
 * Oahu Sugar Company
 * Honolulu Plantation Company
 * Waiahole Water Company
 * Waialua Agricultural Company
 * Waianae Sugar Company
 * Waimanalo Sugar Company