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The International Heavy Haul Association IHHA is a world wide nongovernmental scientific and technological association of heavy haul railways and their advocates Learn More We promote heavy haul rail industry through conferences research and publications. The IHHA is dedicated to the pursuit of excellence in heavy haul railway operations engineering maintenance and technology. It strives to accomplish this mission through the acquisition of knowledge relevant to this goal by sponsoring and organising international and regional conferences specialist technical sessions and specialist seminars by commissioning guideline manuals by preparing and distributing conference proceedings and technical documentation and by related activities as recommended by the Board of Directors. The IHHA engages in a continual process of adaptation to ensure it satisfies the demands of stateoftheart technical information that is relevant in a changing and developing industry.