MTH & Lionel power question

I am surprised there haven't been a lot of responses, maybe Friday the 13th has something to do with it?

The big issue is the MTH bricks have a very good circuit breaker and old transformers do not. You would need to add something similar without knowing the specs on what you are trying to mimic or protect in the z controller.  There are a bunch of threads on breaker choices and airpax was one many liked.

@SteveH who has done research on these options

Using another transformer with the Z controller could be done if a few considerations are understood and implemented.  Before getting into those, please help me understand what benefits are expected by using a Z Controller with an already variable output transformer?