A competition for posters inspired by Old Father Thames is under way for illustrators and artists from all over the world.

The winning selection of 50 shortlisted artworks showing the river as an inspiration is to go on public display at the London Transport Museum next month.

The winners will be announced at an award ceremony the day before, followed by the best entry appearing as a transport poster on bus and rail services.

Entries submitted by professionals and students for the 2011 Serco Prize for Illustration, awarded by the DLR operators, have a short text by the artists summarising the inspiration behind their creation.

The competition continues a tradition of poster design going back more than a century. The museum’s collection of graphic art is reputed to be one of the best in the world, some 5,000 works by famous artists including Man Ray, Paul Nash and Edward McKnight Kauffer.

The River Thames exhibition goes on show on May 10 at the London Transport Museum in Covent Garden, admission �13.50 (�10 concessions), under 16s free.