Lionel has some instructions here http://www.lionel.com/ForTheHobbyist/GeneralTipsAndFAQs/TechTip3.cfm#ControlSystem for modifying O-27 switches for use with a constant voltage like the O gauge 022 switches. However, if you follow their instructions, it is likely you will fry the coils in the switches. I suggest anyone considering this modification read Bob Nelson’s instruction on this modification as it will not result in fried coild.
Bruce Baker