The ones I worked on that were on the Westinghouse equipment were really a car control and dispatcher that could be switched over if needed to the old dispatcher. Neat idea but dubious as to if would work since the old dispatcher probably sucked in the first place. Otherwise you would have not sold the mod. We had a few flavors of the CVT product. Some of them used an Amicon generator regulator, some a Valuetrol drive( analog GE drive) and later they went to the GE DC300E drive. They also later incorporated a small computer running UNIX as a primitive artificial intelligent dispatcher. The idea was sort of a data matrix storage in 15 minute increments in which the car would compare what it did a day or week ago at the same time. I am not convinced it actually learned anything but I did learn UNIX because of it which was a good thing.