SSPL Science & Society Picture Library (SSPL) is the centralised image repository of the National Museum of Science & Industry, which comprises the Science Museum, the National Railway Museum and the National Media Museum. SSPL also represents a number of other related image collections from outside of the museums, many of which are available for purchase as prints online. The Science Museum houses the world's largest scientific collection, and contains some of the most significant objects in the history of science, industry, technology and transport. The National Railway Museum is the largest railway museum in the world. The museum's extensive archive of railway images comprises 1.4 million photographs, posters, paintings and prints dating from the earliest days of rail travel to the present day. The National Media Museum looks after one of the world's most significant collections of historical photographs, which in 2003 was further enhanced by the acquisition of the Royal Photographic Society Collection. The museum's collections contain works by many of the most celebrated names in photographic history, including Julia Margaret Cameron, Roger Fenton, William Henry Fox Talbot, Lewis Carroll and many more. The collection contains over 40,000 images which are available to buy in a various sizes and finishes, as well as stretched canvases and framed prints. The vintage posters can also be custom ordered in original Double and Quad Royal sizes.