H Frame Bogie Handbrake Handing Headstock [[Headway]] [[High_Speed_Train_(HST)]] Horn (1) Horn (2) Horn (3) Hose Hostler Hot Box HSDPA High-Speed Downlink Packet Access HSUPA High-Speed Uplink Packet Access HSPA HSDPA and HSUPA combined HSPA Plus or HSPA Evolved Hunting