Hey Daan,
While poking through the Lionel repair manuals (reprints), there is an intriguing note in the writeup for the Lionel type “V”, last made in 1947.
" Type ‘V’ transformer is rated at 150 watts and is able to deliver continuously approximately 110 watts, or about 8 amperes at the working track voltage. This transformer can be used with power lines of 110-125 volts, 50-60 cycles."
I do not know how good this reference is, but many of the other transformer descriptions in the manual clearly specify “60 cycles only.”
Hey and this guy has 4 independently adjustable voltage outputs of 6 - 24 volts (open circuit). Also uses the same carbon roller as the ZW.
Regards,
Roy