Postwar trains like postwar transformers best. Old trains and newer transformers don't mix well, the same is said for modern trains and older transformers don't mix well. Older postwar engines will growl and excessively heat as the motors don't like chopped waves of modern transformers. Also no compensation windings for postwar whistles. Using older transformers to run newer trains with electronics lose lower speed control, and the whistle and bell control is erratic at best. The older trains will run on Fastrack just fine.
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