Abstract: Aggregate, fragmented material and the like is transported in a pipeline by introducing foam under pressure into the pipeline along with the aggregate, fragmented material and the like to be transported and the foam and aggregate, fragmented material and the like are maintained at a pressure to move the aggregate, fragmented material and the like and foam along the pipeline. The foam may be regenerated at spaced positions along the pipeline by introducing additional foam into the pipeline or introducing gas under pressure into the pipeline to agitate the foam. The gas phase of the foam, as well as the gas employed to regenerate the foam consists essentially of one of the group consisting of air, nitrogen, natural gas or carbon dioxide and the liquid phase of the foam consists essentially of one of the group consisting of water, brine or oil.