Heavy horses played a pivotal role in the development of western economies, toiling in mines and quarries, factories and docks, alongside canals and railways and on farms. But, following the introduction of motorized machinery their number plummeted and some breeds came close to extinction in the 1950s. Interest has been revived and today Shires, Clydesdales, Suffolks and British Percherons attract special attention wherever they are seen, their strength,...