London Transport Museum in partnership with Transport for London
Double royal has been the standard poster size used by the Underground since 1908. This 40 x 25 inch format has been used almost exclusively by railway companies.
Print, Framed print, Image licence
Panel posters were produced for display in Underground car interiors, as well as on the inside and outside of buses and trams. Because they did not have to fit a standard frame or wall space, they are smaller than other poster formats and vary slightly in size.
Double crown is the descriptive size for posters that are 30 x 20 inches. This is slightly smaller than the standard double royal size, which is the most commonly used by the Underground. Double crown posters were originally displayed on the front panel of buses and the side panels of trams.
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