Fuelling stations, also known as coaling stations, are repositories of fuel (coal & later oil) that have been located to service commercial and naval vessels. Today, the term "coaling station" can also refer to coal storage and feeding units in fossil-fuel power stations.
Initially named a coaling station due to the use of coal for steam generation a fuelling station was built for the purpose of replenishing coal supplies for ships or railway locomotives. The term is often associated with 19th and early 20th century seaports associated with blue water navies, who used coaling stations as a means of extending the range of warships. In the late 19th century steamships powered by coal began to replace sailing ships as the principal means of propulsion for ocean transport. Fueling stations transitioned to oil as steam engines gave way to internal combustion power plants.
Countries with large naval forces must maintain means for fueling their fleets in times of conflict, to this end defended fueling stations were set up around theaters of operations. Examples of such fuelling stations were almost any of the principal ports of the British Isles, Canada, Australia, New Zealand, British Africa, or India. In addition, there were facilities for coaling vessels at St. Helena, Ascension, or the Falkland Islands in the South Atlantic; at Jamaica or Bermuda in the North Atlantic, at Gibraltar, Malta, and Port Said in the Mediterranean; at Aden, on the Gulf of Aden; at Colombo in Ceylon (Sri Lanka); at Singapore; and at Labuan in the China Sea; at Hong Kong on the Chinese coast; at Chagos, Seychelles, or Mauritius in the Indian Ocean; at Thursday Island and Suva, Fiji in the South Pacific: (British) and at Honolulu, Pago Pago and Manila in the Pacific for the United States. While defense of naval fuelling stations has historically focused on attack by other naval powers  the USS Cole bombing in the Yemeni port of Aden in October 2000 has focused attention on the importance of ship defense during refueling operations even in friendly fueling stations.
Commercial fuelling stations
As international trade grew a defined set of fixed routes, or sea lanes were established with fuelling stations appearing at strategic points along these routes. Since most fuelling stations did not possess natural resources in coal or oil the “bunkering” trade of transporting coal and oil to fueling stations consumed a considerable portion of shipping tonnage. As shipbuilding progressed to ever-larger ships, additional fuel storage capacity was incorporated into ship design that afforded greater range between refueling stops. Today most ocean going vessels have the ability to fuel for an uninterrupted ocean crossing at their terminal locations before setting to sea.