A community mural painted by children on a railway bridge is under threat due to Network Rail's refusal to mantain it (link below.)
http://news.bbc.co.uk/1/hi/england/london/6189929.stm

Mill Lane railway bridge in West Hampstead , north west London , has become a proud landmark for residents after it was decorated six years ago.

Artist Charlotte Gerrard , who organised the artwork , is campaigning for Network Rail to pay for its restoration.

But Network Rail have so far refused , saying the work would not fit their "standard maintenance regime".