This engine is developed on Dan Siskind's
wonderful wild west steam engine.
All credits for this engine goes to Dan.
http://www.brickmania.com/

As many others, I have found that adding 
wheels from BBB http://www.bigbenbricks.com/ 
gives your locomotive more realism.

I have added a motor to the drivers of the
locomotive, along with the standard train
motor, this locomotive has traction on 8 wheels.