A General Plan for a Mail Communication by Steam, Between Great Britain and the Eastern and Western Parts of the World is a visionary 19th-century treatise authored by James MacQueen, first published in 1838. The book presents a comprehensive and ambitious proposal for revolutionizing global communication and commerce through the establishment of regular steamship mail routes connecting Great Britain with its far-flung colonies and trading partners in the East and West, including the Americas, the West Indies, Africa, India, and beyond. MacQueen meticulously outlines the logistical, economic, and strategic advantages of using steam-powered vessels over traditional sailing ships, emphasizing the dramatic reduction in travel time, increased reliability, and enhanced security for both mail and passengers. The work is notable for its detailed analysis of potential routes, ports of call, and the necessary infrastructure to support such an enterprise, including coaling stations and ship maintenance facilities. MacQueen supports his arguments with extensive data on distances, travel times, and the commercial and political importance of rapid communication for the British Empire. He also addresses the technical challenges of steam navigation, the financial implications, and the broader impact on international trade, diplomacy, and imperial administration. A General Plan for a Mail Communication by Steam is both a product of its time and a forward-looking document, reflecting the era’s faith in technological progress and the central role of Britain in global affairs. It offers valuable insights into the early development of global communication networks and the interplay between technology, commerce, and empire. The book remains a significant historical source for understanding the origins of modern international mail and transportation systems, as well as the ambitions and anxieties of the Victorian age.