  : As a newcomer, the above discussion is fascinating. For what it's worth, I do not believe that Tornado can be considered anything other than a replica, and therefore not a part of the original series of engines.  For starters it was built at a different time and using greatly different techniques. More importantly, the people that built the original and the replica are a generation apart.  Using the car as a comparison, it is like comparing a original to a kit-car. The similarity betweent them starts and ends in the appearance.   