The recent appearance of a Lionel ca. 1935 Blue Comet set on the PBS Antiques Roadshow television show has sparked a discussion on the 0 Gauge RR Tinplate Trains forum. One time I remember reading a reference to someone who had a "Wall Of Blue Comets." How many variations are there besides the more common and easily recognizable ones? McComas & Tuhoy state that there are over 30 variations of the 400E. Are there that many, or more, variations of the Blue Comet set?