Pre the Great War, especially during the 'Excersise Season' August September, the military would hire horses off the railways.
I was invited to a dig near Thiepval a few years back. It was a pond caused by a mine exploded under a farmhouse that had been part of the Triple Alliance front line. Amongst the artifcats were parts of a civillian draught horse tack, including the collar. For those that don't know a draught horse collar, it is one of the finest works of leather made by man. All hand made, no machine could stich it, and the cost would have been the same as a small car now. A farm could not have worked without one. Yet it appers the family abndoned it. It really brought home to me the cost of war.