Pack train refers to a group of pack animals, often used to transport goods or supplies across long distances, particularly in remote areas. There are several synonyms that can be used instead of pack train, including mule train, caravan, expedition, cavalcade, and procession. A mule train specifically refers to a group of mules carrying goods, while a caravan is a broader term that describes a group of people or animals traveling together. An expedition may refer to a group of explorers or scientists traveling to a remote location. Cavalcade and procession both suggest a formal or organized group, with cavalcade also implying a group of horses. All of these terms can be used interchangeably with pack train depending on the context.