;GWSR:Gloucestershire Warwickshire Steam Railway (Commonly known as the Gloucestershire Warwickshire Railway)
;Hawksworth:Frederick Hawksworth, Chief Mechanical Engineer (CME) of the Great Western Railway 1941-1948
;Hill:Alfred John Hill, Chief Mechanical Engineer (CME) of the Great Eastern Railway 1912-1922
;HLF:Heritage Lottery Fund
;Holden:Stephen Dewar Holden, Chief Mechanical Engineer (CME) of the Great Eastern Railway 1908-1912