I have re-built a totaled Steamlines Shay. The design is flawed seriously in my mind, at least the "smoking version". I would suggest not having the super heater installed above the burner. In fact, leave the super heater out. It super heats exhaust in order to produce darker steam from the smokestack.
In any case, ask the questions and I will do my best to respond as will Jim. Gary - chilling in Eugene, Oregon http://www.angelfire.com/or/trainguy http://community.webshots.com/user/raltzenthor
