Providing 14v (from a separate transformer for track power) to the switches via the fixed voltage plug-in on switches is an ideal arrangement. Be sure the two transformers are "in phase."
This method provides full throttle track power to locomotives without draw-downs for switches (or accessories) and delivers accurate 14v to the switches.
I used terminal blocks on my layout to distribute 14v to 11 switches (a mix of Lionel and K-line O42 switches) from a separate MTH transformer; primarily because I applied 18v for track voltage from a Lionel 135w "brick" to drive TMCC-equipped locos . Never had a problem.
Mike Mottler LCCA 12394