The Encline Designs team has created this cool steampunk model of Optimus Prime, the Autobot leader in the Transformers universe, which transforms from robot to steam train.
The model features functional lights and wheels that roll, and a detachable trailer that Optimus uses as a secondary weapon, similar to the trailer in his well-known firetruck mode.
Link
Encline added paint and electronics: http://www.tfw2005.com/boards/radicons-customs/299432-steampunk-hearts-steel-prime.html
The figure itself is produced by these guys: http://mastermindcreation.blogspot.com/
The original concept was created by IDW's Guido Guidi: http://tfwiki.net/wiki/Hearts_of_Steel