A "unique opportunity" to create art that will be seen by millions is on offer in North East England.
Tyne and Wear Metro operator Nexus is commissioning artists to create large-scale works for the inside of its 46-train fleet.
Project grant funding from Arts Council England (ACE) has enabled what is believed to be a world first - a permanent commission within a new train.
"This is a great opportunity for a number of different artists to produce exciting work reflecting the heritage and diversity of the region," ACE Director North Jane Tarr commented.
Applications close February 28.