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edits
Changes
m
Heritage Lottery Fund now the National Lottery Heritage Fund from 2019
;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
;HLF:Heritage Lottery Fund (National Lottery Heritage Fund from 2019)
;Holden:Stephen Dewar Holden, Chief Mechanical Engineer (CME) of the Great Eastern Railway 1908-1912
;Hot box:A situation that occurs when an axle bearing overheats, causing damage to the axle box and the axle itself.
