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Add Heritage Railway Association
;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.
;HRA:Heritage Railway Association
;Instanter:A type of three link chain coupling with a special triangular-shaped middle link which provides sufficient slack for coupling, but when rotated through 90 degrees shortens the length of the chain, reducing the slack without the need to wind a screw.
;Internal User:Rolling stock used for the railway’s internal purposes (stores etc.) at one fixed location.