Queensland Rail has embraced a piece of illegal guerilla art by including it in an official 3D representation of Central Station's $67 million upgrade.

It also confirmed Smoke, by anonymous street artist the Blu Art Xinja (pronounced "ninja"), would remain on the chimney of Central's heritage-listed entrance building on Ann Street.

Smoke, by guerrilla street artist Blue Art Xinja, has been at Central Station since 2012. Credit:Tammy Law

The enigmatic artist, who attached the sculpture to the chimney in 2012, said he was thrilled to see Smoke included in QR's virtual reality model of the Central Station makeover, which were linked to from the project's official website.

The project was due to be completed in about three years.