H. Cegielski – Fabryka Pojazdów SzynowychPoland
H. Cegielski – PoznańPoland
Hamamatsu WorkshopJapanHamar JernstøperiPeople's Republic of ChinaHannoversche WaggonfabrikGermanyHansa WaggonbauGermany
Harley-DavidsonUnited States
Henschel & SohnGermany
Hillside Railway WorkshopsNew Zealand
HiPhiPeople's Republic of China
HitachiJapanHitachi Rail1910
Hitachi Rail ItalyItaly
Holgate Road carriage worksUnited Kingdom
HondaJapan
HondaJapanHongqiPeople's Republic of China
Hutt WorkshopsNew Zealand
Hyptec2022
Hyundai Motor GroupGermany
Hyundai RotemSouth KoreaHägglund & SönerSweden
Høka1936